diff --git a/params.py b/params.py
new file mode 100644
index 0000000..e7ecb17
--- /dev/null
+++ b/params.py
@@ -0,0 +1,49 @@
+# coding: utf-8
+
+class PlotParams:
+    """
+    Plot parameters
+    """
+    out_ext   =  '.jpeg'               # extension for plots
+    put_title = False                  # Add a title to plot
+    ntick     = 6                      # Number of ticks for maps
+    set_lim   = True                   # Set default limits
+    vel_red   = 40                     # Take point each vel_red for velocities
+
+
+
+class DiskParams:
+    """
+    Disk speficic parameters
+    """
+    on       = False                   # Enable specific disk analysis
+    pos_star = np.array([1., 1., 1.])  # Position of the central star
+
+
+class PymsesParams:
+    """
+    Parameters for Pymses reader
+    """
+    order = '<'                        # In which order the output are read
+    fft   = False                      # Quick and dirty rendering using FFT
+
+class OutputParams:
+    """
+    Parameters for post processing
+    """
+    center   =  [0.5, 0.5, 0.5]        # Center of the image
+    zoom     = 1.                      # Zoom  of the image
+    map_size = 512                     # Size of the computed maps in pixel
+
+    tag      = ""                      # Tag for the image
+
+
+class Params:
+    """
+    Strutured parameters for the post processing
+    """
+    disk   = DiskParams()
+    pymses = PymsesParams()
+    out    = OutputParams()
+    plot   = PlotParams()
+
diff --git a/plotter.py b/plotter.py
new file mode 100644
index 0000000..46dd738
--- /dev/null
+++ b/plotter.py
@@ -0,0 +1,329 @@
+# coding: utf-8
+
+import sys
+import os
+import tables
+import numpy as np
+import matplotlib as mpl
+if os.environ.get('DISPLAY','') == '':
+    print('No display found. Using non-interactive Agg backend')
+    mpl.use('Agg')
+from matplotlib.patches import Polygon
+import pylab as Pfrom scipy.stats import linregress
+import matplotlib.patches as mpatches
+from matplotlib.collections import PatchCollection
+
+from pp_params import *
+
+
+P.rcParams['image.cmap']='plasma'
+P.rcParams['savefig.dpi']=400
+
+tex_params= {'text.latex.preamble' : [r'\usepackage{amsmath}']}
+P.rcParams.update(tex_params)
+
+
+class Plotter:
+    """
+    This class loads derived quantities and plot them
+    """
+
+    # Axes information
+    _ax_nb    =  {'x' : 0, 'y' : 1,  'z' : 2}        # Number of each axes
+    _axes_h   =  {'x' :'y', 'y' : 'x',  'z' : 'x'}   # Associated horizontal axe
+    _axes_v   =  {'x' : 'z', 'y' : 'z',  'z' : 'y'}  # Associated vertical axe
+    _ax_title =  {'x' : r'$x$ (code)', 'y' : r'$y$ (code)',  'z' : r'$z$ (code)'}
+
+    G = 1. # Gravitational constant
+
+    def __init__(self, path_out='.', filename=None, pp_params=Params()):
+
+        self.pp_params = pp_params
+
+        # Determining output directory
+        if path_out is None:
+            if filename is None:
+                self.path_out='.'
+            else:
+                self.path_out = os.path.dirname(filename)
+        else:
+            self.path_out = path_out
+
+        # Find HDF5 file
+        if filename is None:
+            if not pp_params.out.tag == '':
+                tag_name = '_' + pp_params.out.tag
+            else :
+                tag_name = ''
+                self.filename = (self.path_out + '/postproc_' +
+                                 tag_name + format(num,'05') + '.h5')
+        else:
+            self.filename = filename
+
+    def plot_list(self, to_plot_list, axes, overwrite=False):
+        self._file_out = tables.open_file(self.filename, mode="r")
+        maps = self._file_out.root.maps
+
+        for ax_los in axes:
+            for name in to_plot_list:
+                name_full =  name + '_' + ax_los
+                plot_filename = self._find_filename(name_full)
+                if overwrite or not os.path.exists(plot_filename):
+                    self._plot_map(name, ax_los)
+                    P.savefig(plot_filename)
+                else:
+                    print("Data for {} is already computed, skipping...".format(name_full))
+
+        self._file_out.close()
+
+
+
+    def _plot_map(self, name, ax_los):
+        P.figure()
+
+        ax_h = self._axes_h[ax_los]
+        ax_v = self._axes_v[ax_los]
+        im_extent = self._file_out.root.maps._v_attrs.im_extent
+        radius = self._file_out.root.maps._v_attrs.radius
+        center = self._file_out.root.maps._v_attrs.center
+
+        if (name == 'Q' and not ax_los == 'z') or name == 'levels' or name=='speed':
+            return
+
+        dmap = self._file_out.get_node('/maps/{}_{}'.format(name, ax_los)).read()
+
+        if name == 'Q' :
+            im = P.imshow(dmap,
+                          extent=im_extent,
+                          origin='lower',
+                          cmap='RdBu',
+                          norm=mpl.colors.LogNorm(),
+                          vmin=0.01, vmax=100.)
+        elif name == 'jeans_ratio' :
+            im = P.imshow(dmap,
+                          extent=im_extent,
+                          origin='lower',
+                          cmap='RdBu',
+                          norm=mpl.colors.LogNorm(),
+                          vmin=0.1, vmax=1000.)
+        else:
+            im = P.imshow(dmap,
+                          extent=im_extent,
+                          origin='lower',
+                          norm=mpl.colors.LogNorm())
+
+        P.locator_params(axis=ax_h, nbins=pp.params.plot.ntick)
+        P.locator_params(axis=ax_v, nbins=pp.params.plot.ntick)
+
+        if(self.pp_params.put_title):
+            pass
+
+        P.xlabel(self._ax_title[ax_h])
+        P.ylabel(self._ax_title[ax_v])
+
+        cbar = P.colorbar(im)
+
+        if name == 'coldens':
+            cbar.set_label(r'$\Sigma$ (code)')
+
+            if pp.params.set_lim:
+                im.set_clim(0.01, 100)
+
+            # if 'levels' in names:
+            #     map_level = self._file_out.get_node('/maps/{}_{}'.format('levels', ax_los)).read()
+            #     # Computing linewidths
+            #     levels_ar = np.arange(np.min(map_level), np.max(map_level) + 1)
+            #     lw = np.ones(levels_ar.size) * 2
+            #     lvl_th = 8 # Level threeshold for reducing linewidths
+            #     lw[levels_ar >= lvl_th] = lw[levels_ar >= lvl_th]**(lvl_th - levels_ar[levels_ar >= lvl_th])
+            #     lw[levels_ar < lvl_th] = 1.
+
+            #     cont = P.contour(map_level,
+            #                      extent=im_extent,
+            #                      origin='lower',
+            #                      colors='white',
+            #                      linewidths=lw,
+            #                      levels=levels_ar)
+            #     cont.levels = cont.levels + 1
+
+            #     P.clabel(cont,
+            #              cont.levels[cont.levels < 11],
+            #              inline=1, fontsize=8., fmt='%1d')
+        elif name == 'rho':
+            cbar.set_label(r'$\rho$ (code)')
+
+            if 'speed' in names:
+                dmap_vh =  self._file_out.get_node('/maps/{}{}_{}'.format('v', ax_h, ax_los)).read()
+                dmap_vv =  self._file_out.get_node('/maps/{}{}_{}'.format('v', ax_v, ax_los)).read()
+
+                vel_red = self.pp_params.plot.vel_red
+
+                map_vh_red = dmap_vh[::vel_red,::vel_red] # take only a subset of velocities
+                map_vv_red = dmap_vv[::vel_red,::vel_red]
+                nh = map_vh_red.shape[0]
+                nv = map_vv_red.shape[1]
+                vec_h = (np.arange(nh)*2./nh*radius - radius + center[0] + radius/nh) * lbox
+                vec_v = (np.arange(nv)*2./nv*radius - radius + center[1] + radius/nv) * lbox
+                hh, vv = np.meshgrid(vec_h,vec_v)
+                max_v = np.max(np.sqrt(map_vh_red**2 + map_vv_red**2))
+
+                Q = P.quiver(hh, vv, map_vh_red, map_vv_red, units='width')
+                P.quiverkey(Q, 0.7, 0.95, max_v,
+                            r'$'+str(max_v)[0:4]+'$ (code)', labelpos='E', coordinates='figure')
+
+        elif name == 'T':
+            cbar.set_label(r'$T (code)$')
+        elif name == 'Q':
+            cbar.set_label(r'$Q$')
+        elif name == 'jeans':
+            cbar.set_label(r'Jeans\'s lenght')
+        else:
+            cbar.set_label(name)
+
+    def _find_filename(self, name_full):
+        num = self._file_out.root._v_attrs.num
+        return (self.path_out + '/' + name_full + '_' +
+                self.pp_params.out.tag + '_' + format(num,'05') +
+                self.pp_params.plot.out_ext)
+
+
+
+class InteractiveGUI:
+    """
+    This is a matplotlib interactive session to restrain analysis to a specific area
+    """
+
+    def onbuttonrelease(self, event):
+        """Deal with click events"""
+        button = ['left','middle','right']
+        toolbar = P.get_current_fig_manager().toolbar
+        if toolbar.mode=='zoom rect' and event.inaxes == self.ax_col:
+            print("zooming ")
+            xlim = self.ax_col.get_xlim()
+            ylim = self.ax_col.get_ylim()
+            self.reset_mask()
+        elif self.add_mask and event.inaxes == self.ax_col:
+            self.plot_side()
+            P.draw()
+
+    def onbuttonpress(self, event):
+        """Deal with click events"""
+        button = ['left','middle','right']
+        toolbar = P.get_current_fig_manager().toolbar
+        if toolbar.mode!='':
+            print("You clicked on something, but toolbar is in mode {:s}.".format(toolbar.mode))
+        print(self.add_mask)
+        if self.add_mask and toolbar.mode=='' and event.inaxes == self.ax_col:
+            ix, iy = event.xdata, event.ydata
+            print("Add patch {}, {}".format(ix, iy))
+            xlim = self.ax_col.get_xlim()
+            ylim = self.ax_col.get_ylim()
+            radius = 0.05 * min(abs(xlim[1] - xlim[0]), abs(ylim[1] - ylim[0]))
+            circle = mpatches.Circle([ix, iy], radius,  color='black', alpha=0.1,  ec="none")
+            self.circles.append(circle)
+            self.ax_col.add_artist(circle)
+            self.ax_col.draw_artist(circle)
+            self.patch_mask = self.patch_mask | ((self.xx - ix)**2 + (self.yy -iy)**2 < radius**2)
+            #self.plot_side()
+
+    def onkeypress(self, event):
+        """whenever a key is pressed"""
+        if not event.inaxes:
+            return
+        if event.key == 't':
+            self.add_mask = not self.add_mask
+            print("Add mode is {}".format(self.add_mask))
+        elif event.key == 'r':
+            self.reset_mask()
+
+    def plot_side(self):
+        if (self.add_mask):
+            mask = (self.patch_mask & self.mask).flatten()
+        else:
+            mask = self.mask.flatten()
+        self.ax_gamma.clear()
+        P.sca(self.ax_gamma)
+        plot_dcsdrho(self.fluct_maps, mask, tag=self.tag)
+
+        self.ax_pdf.clear()
+        P.sca(self.ax_pdf)
+        sigma_pdf(self.fluct_maps, mask, tag=self.tag, nb_bin_hist=self.args.pdf_nb_bin)
+
+    def reset_mask(self):
+        xlim = self.ax_col.get_xlim()
+        ylim = self.ax_col.get_ylim()
+        self.mask = (self.xx >= xlim[0]) & (self.xx <= xlim[1]) & (self.yy >= ylim[0]) & (self.yy <= ylim[1])
+        self.patch_mask = np.full(self.mask.shape, False)
+        for circle in self.circles:
+            circle.remove()
+        self.circles = []
+        self.plot_side()
+        P.draw()
+
+
+
+    def __init__(self, args, path, num,
+                 maps_disk=None,
+                 tag='',
+                 set_lim=True) :
+        """
+        Interactive plotting
+
+        Parameters
+        ----------
+        num       output number
+        path      path of the pipeline output
+
+        """
+        self.args = args
+        self.add_mask = False
+        self.circles = []
+        self.tag = tag
+
+        path_out = path
+
+        # Load maps file
+        print("load maps file")
+        name_maps = path + '/maps_disk' + '_' + tag + '_' + format(num,'05') + '.save'
+
+        if maps_disk is None:
+            if (len(glob.glob(name_maps)) == 0):
+                raise IOError('no pickle file for disk maps {}. Run make_image_disk() first'.format(name_maps))
+        f = open(name_maps,'r')
+        maps_disk = pickle.load(f)
+        f.close()
+        print("maps file loaded")
+
+        im_extent   = maps_disk['im_extent']
+
+        fig = P.figure();
+        self.ax_col = P.subplot(1, 2, 1)
+        coldens = maps_disk['coldens_z']
+        im = self.ax_col.imshow(coldens,
+                                extent=im_extent,
+                                origin='lower',
+                                norm=mpl.colors.LogNorm())
+        if set_lim:
+            im.set_clim(0.01, 100)
+        self.ax_col.set_xlabel(r'$x$')
+        self.ax_col.set_ylabel(r'$y$')
+
+        self.xx, self.yy, self.fluct_maps = disk_pdf(path, num, maps_disk, tag=self.tag, force=True, put_title=False, interactive=True)
+        coord_flat = zip(self.xx.flatten(), self.yy.flatten())
+
+        self.ax_gamma = P.subplot(2, 2, 2)
+        self.ax_pdf = P.subplot(2,2,4)
+
+        xlim = self.ax_col.get_xlim()
+        ylim = self.ax_col.get_ylim()
+        self.mask = (self.xx >= xlim[0]) & (self.xx <= xlim[1]) & (self.yy >= ylim[0]) & (self.yy <= ylim[1])
+        self.patch_mask = np.full(self.mask.shape, False)
+
+        self.plot_side()
+
+        fig.canvas.mpl_connect('button_release_event', self.onbuttonrelease)
+        fig.canvas.mpl_connect('button_press_event', self.onbuttonpress)
+        fig.canvas.mpl_connect('key_press_event', self.onkeypress)
+
+        P.tight_layout()
+        P.show()
diff --git a/postprocessor.py b/postprocessor.py
new file mode 100644
index 0000000..c75e676
--- /dev/null
+++ b/postprocessor.py
@@ -0,0 +1,276 @@
+# coding: utf-8
+
+import sys
+import os
+
+import tables
+import pymses
+import numpy as np
+from numpy.polynomial.polynomial import polyfit
+from pymses.sources.ramses import output
+from pymses.sources.hop.file_formats import *
+from pymses.analysis import Camera, raytracing, slicing, splatting
+from pymses.filters import CellsToPoints
+from pymses.analysis import ScalarOperator, FractionOperator, MaxLevelOperator
+
+from pp_params import *
+
+class Rule:
+
+    def __init__(self, process, description, group='', dependencies=[], axes=['x', 'y', 'z'],
+                 is_valid=lambda save, ax:True):
+        self.process_fn = process
+        self.dependencies = dependencies
+        self.is_valid_add = is_valid
+        self.group = group
+        self.axes = axes
+        self.description = description
+
+    def process(self, ax_los):
+        return self.process_fn(ax_los)
+
+    def is_valid(self, save, ax):
+        valid = True
+        for dep in self.dependencies:
+            valid = valid and self.group + '/' + dep + '_' + ax in save
+        return ax in self.axes and valid and self.is_valid_add(save, ax)
+
+class PostProcessor:
+    """
+    This class enable to compute and save derived quantities from the raw output
+    """
+
+    # Axes information
+    _ax_nb    =  {'x' : 0, 'y' : 1,  'z' : 2}        # Number of each axes
+    _axes_h   =  {'x' :'y', 'y' : 'x',  'z' : 'x'}   # Associated horizontal axe
+    _axes_v   =  {'x' : 'z', 'y' : 'z',  'z' : 'y'}  # Associated vertical axe
+
+    G = 1. # Gravitational constant
+
+
+    def __init__(self, path, num, path_out=None, pp_params=Params()):
+        """
+        Creates the basic structures needed for the outputs
+        """
+
+        # TODO : Make possible to load the HDF5 file even without the original file
+        self.pp_params = pp_params
+
+        # Determining output directory
+        if (path_out is None):
+            path_out = path
+
+        # Open outfile
+        if not pp_params.out.tag == '':
+            tag_name = '_' + pp_params.out.tag
+        else :
+            tag_name = ''
+
+        self.filename = (path_out + '/postproc_' +
+                         tag_name  + format(num,'05') + '.h5')
+        self.save = tables.open_file(self.filename, mode="a",
+                                         title=os.path.basename(path) + format(num,'05'))
+
+        # Ramses Output
+        self._ro = pymses.RamsesOutput(path, num, order=pp_params.pymses.order)
+        self._amr = self._ro.amr_source(["rho","vel","P"])
+
+        # Density operator
+        self._rho_op = ScalarOperator(lambda dset: dset["rho"], self._ro.info["unit_density"])
+
+        # Density ray tracer
+        if(pp_params.pymses.fft):
+            self._rt = splatting.SplatterProcessor(self._amr, self._ro.info, self._rho_op)
+        else:
+            self._rt = raytracing.RayTracer(self._amr, self._ro.info, self._rho_op)
+
+        # Set the extend of the image
+        self._radius = 0.5 / pp_params.out.zoom
+        self._lbox = self._ro.info['boxlen']
+        center = pp_params.out.center
+        im_extent = [(- self._radius + center[0]) * self._lbox,
+                 (  self._radius + center[0]) * self._lbox,
+                 (- self._radius + center[1]) * self._lbox,
+                 (  self._radius + center[1]) * self._lbox]
+
+        # Get time
+        time = self._ro.info['time'] # time in codeunits
+
+        # Set post processing attributes
+        self.save.root._v_attrs.num = num
+        self.save.root._v_attrs.lbox = self._lbox
+        self.save.root._v_attrs.time = time
+
+        self.save.root.maps._v_attrs.center = center
+        self.save.root.maps._v_attrs.radius = self._radius
+        self.save.root.maps._v_attrs.im_extent = im_extent
+
+
+        # Initialize cameras
+        self._cam = dict()
+        for ax_los in self._ax_nb : # los = line of sight
+            ax_h = self._axes_h[ax_los]
+            ax_v = self._axes_v[ax_los]
+
+            self._cam[ax_los] = Camera(center=pp_params.out.center,
+                                      line_of_sight_axis=ax_los,
+                                      region_size=[2.*self._radius, 2.*self._radius],
+                                      distance=self._radius,
+                                      far_cut_depth=self._radius,
+                                      up_vector=ax_v,
+                                      map_max_size=pp_params.out.map_size)
+        self.save.close()
+        self.def_rules()
+
+    def process(self, to_process_list, axes, overwrite=False):
+        """
+        Render the data in to_process_list and save them
+        """
+        self.save = tables.open_file(self.filename, mode="a")
+        for name in to_process_list:
+            if name in self.rules:
+                rule = self.rules[name]
+                for ax_los in axes:
+                    # Solve dependencies
+                    for dep in rule.dependencies:
+                        if dep in self.rules:
+                            rule_dep = self.rules[dep]
+                            self._process_rule(dep, rule_dep, ax_los, overwrite)
+                        else:
+                             print("ERROR: Dependency {} for {} is unknown".format(dep, name))
+                    # Process rule
+                    self._process_rule(name, rule, ax_los, overwrite)
+            else:
+                print("ERROR: {} is unknown".format(name))
+        self.save.close()
+
+    def _process_rule(self, name, rule, ax_los, overwrite):
+         name_full = rule.group + '/' + name + '_' + ax_los
+         if rule.is_valid(self.save, ax_los):
+             if overwrite or not name_full in self.save:
+                 data = rule.process(ax_los)
+                 self._save_data(name_full, data, rule.description)
+             else:
+                 print("Data for {} is already computed, skipping...".format(name_full))
+         else:
+             print("ERROR: {} is not valid in this context".format(name_full))
+
+
+    def _save_data(self, name_full, data, description):
+        """
+        Save data in the HDF5 structure, overwrite if necessary
+        """
+        if name_full in self.save:
+            node = self.save.get_node(name_full)
+            del node
+        self.save.create_array(os.path.dirname(name_full), os.path.basename(name_full),
+                               data, description, createparents=True)
+
+    def _coldens(self, ax_los):
+         datamap  = self._rt.process(self._cam[ax_los], surf_qty=True)
+         return  datamap.map.T * self._lbox
+
+    def _rho(self, ax_los):
+        datamap_rho = slicing.SliceMap(self._amr, self._cam[ax_los], self._rho_op, z=0.)
+        return (datamap_rho.map).T
+
+    def _speed_h(self, ax_los):
+        vh_op = ScalarOperator(lambda dset: dset["vel"][:, self._ax_nb[self._axes_h[ax_los]]],
+                               self._ro.info["unit_velocity"])
+        dmap_vh = slicing.SliceMap(self._amr, self._cam[ax_los], vh_op, z=0.).map.T
+        return dmap_vh
+
+    def _speed_v(self, ax_los):
+        vv_op = ScalarOperator(lambda dset: dset["vel"][:, self._ax_nb[self._axes_v[ax_los]]],
+                               self._ro.info["unit_velocity"])
+        dmap_vv = slicing.SliceMap(self._amr, self._cam[ax_los], vv_op, z=0.).map.T
+        return dmap_vv
+
+    def _temperature(self, ax_los):
+        P_op = ScalarOperator(lambda dset: dset["P"], self._ro.info["unit_pressure"])
+        dmap_P = (slicing.SliceMap(self._amr, self._cam[ax_los], P_op, z=0.)).map.T
+        dmap_rho = self.save.get_node("/maps/rho_{}".format(ax_los)).read()
+        return dmap_P/dmap_rho
+
+    def _levels(self, ax_los):
+        self._amr.set_read_levelmax(20)
+        level_op  = MaxLevelOperator()
+        rt_level  = raytracing.RayTracer(self._amr, self._ro.info, level_op)
+        datamap   = rt_level.process(self._cam[ax_los], surf_qty=True)
+        return datamap.map.T
+
+    def _jeans(self, ax_los):
+        dmap_T = self.save.get_node('/maps/T_' + ax_los).read()
+        dmap_rho = self.save.get_node('/maps/rho_' + ax_los).read()
+        dmap_jeans = np.sqrt(np.pi * dmap_T / dmap_rho)
+        return dmap_jeans
+
+    def _jeans_ratio(self, ax_los):
+        dmap_jeans = self.save.get_node('/maps/jeans_' + ax_los).read()
+        dmap_levels =  self.save.get_node('/maps/levels_' + ax_los).read()
+        dmap_jeans_ratio = dmap_jeans * 2**(dmap_levels)
+        return dmap_jeans_ratio
+
+    def _toomreQ_disk(self, ax_los):
+        """
+        Compute the Toomre Q parameter in a Keplerian disk
+        """
+
+        # Operator to compute the angular speed times rho
+        def omega_rho_func(dset):
+            pos = dset.get_cell_centers()
+            pos = pos - (self.pp_params.disk.pos_star / self._lbox)
+            xx = pos[:, :, 0]
+            yy = pos[:, :,  1]
+            rc  = np.sqrt(xx**2 + yy**2) # cylindrical radius
+            vx =  dset["vel"][:, :, 0]
+            vy =  dset["vel"][:, :, 1]
+            omega_rho = (1. / rc**2)
+            omega_rho = omega_rho *  dset["rho"]
+            vyx = vy * xx
+            vxy = vx * yy
+            omega_rho = omega_rho * (vyx - vxy)
+            return omega_rho
+
+        # Operator to compute the angular speed
+        omega_op = FractionOperator(omega_rho_func, lambda dset: dset["rho"],
+                                    1. / self._ro.info["unit_time"])
+
+        # Operator to compute the sound speed
+        cs_op = FractionOperator(lambda dset: dset["P"],
+                                 lambda dset: dset["rho"], self._ro.info["unit_velocity"])
+
+        # Ray tracer for the angular speed
+        rt_omega = raytracing.RayTracer(self._amr, self._ro.info, omega_op)
+
+        # Ray tracer for the sound speed
+        if self.pp_params.pymses.fft:
+            rt_cs = splatting.SplatterProcessor(self._amr, ro.info, cs_op, surf_qty=False)
+        else :
+            rt_cs = raytracing.RayTracer(self._amr, self._ro.info, cs_op)
+
+            dmap_omega = rt_omega.process(self._cam[ax_los])
+            dmap_cs = rt_cs.process(self._cam[ax_los])
+            dmap_col = self.save.root.maps.coldens_z.read()
+            map_Q = (self._lbox * dmap_cs.map.T) * dmap_omega.map.T / (np.pi * self.G * dmap_col)
+
+        return map_Q
+
+    def def_rules(self):
+        self.rules = {
+            'coldens' : Rule(self._coldens, "Column density", '/maps'),
+            'rho' : Rule(self._rho, "Density slice", '/maps'),
+            'speed_h' : Rule(self._speed_h, "Horizontal speed slice wrt the line of sight", '/maps'),
+            'speed_v' : Rule(self._speed_v, "Vertical speed slice wrt the line of sight", '/maps'),
+            'T' : Rule(self._temperature, "Temperature slice", '/maps', dependencies=['rho']),
+            'levels' : Rule(self._levels, "Max level within line of sight", '/maps'),
+            'jeans' : Rule(self._jeans, "Jeans lenght slice", '/maps', dependencies=['rho', 'T']),
+            'jeans_ratio' : Rule(self._jeans_ratio, "Jeans' lenght divided by the max resolution",
+                                 '/maps', dependencies=['jeans', 'levels']),
+            'Q' : Rule(self._toomreQ_disk, "Toomre Q parameter for a Keplerian disk", '/maps',
+                       dependencies=['coldens'], axes=['z'],
+                       is_valid=lambda save, axe: self.pp_params.disk.on)
+
+        }
+
+