diff --git a/baseprocessor.py b/baseprocessor.py
index 25522c5..185ed41 100644
--- a/baseprocessor.py
+++ b/baseprocessor.py
@@ -52,7 +52,7 @@ class BaseProcessor:
     rules = {}
     solve_self_dep = True
 
-    def __init__(self, path, path_out=None, params=None, tag=None):
+    def __init__(self, path, path_out=".", params=None, tag=None):
         if params is None:
             self.params = default_params()
         elif type(params) == str:
@@ -60,15 +60,15 @@ class BaseProcessor:
         else:
             self.params = copy.deepcopy(params)
 
-        if tag is not None:
-            self.params.out.tag = tag
-
         # Determining output directory
         if path_out is None:
             self.path_out = path
         else:
             self.path_out = path_out
 
+        if tag is not None:
+            self.params.out.tag = tag
+
     def _log(self, string, status=""):
         if self.params.process.verbose:
             if len(status) > 0:
diff --git a/plotter.py b/plotter.py
index 3939f0c..4af07f3 100644
--- a/plotter.py
+++ b/plotter.py
@@ -119,9 +119,9 @@ class Plotter(Aggregator, BaseProcessor):
     def __init__(
         self,
         path,
-        in_runs=None,
-        in_nums=None,
-        path_out=None,
+        runs=None,
+        nums=None,
+        path_out=".",
         params=None,
         selector=None,
         tag=None,
@@ -136,13 +136,13 @@ class Plotter(Aggregator, BaseProcessor):
         ----------
 
         path : path to the main folder of the simulations (ex '~/simus/myproject')
-        in_runs : list of the runs to consider (ex ['run1', 'run2'])
-        in_nums : list or dict of the outputs numbers to consider (ex [3, 5]
+        runs : list of the runs to consider (ex ['run1', 'run2'])
+        nums : list or dict of the outputs numbers to consider (ex [3, 5]
         or {'run1' : [3, 5], 'run2' : [4, 6])
         path_out : Path where the plot will be saved. By default set to `path`
         params : Parameters for postprocessing. See params module.
-        selector : Existing instance of RunSelector, that selects runs and outputs. If set, in_runs and
-        in_nums will be ignored
+        selector : Existing instance of RunSelector, that selects runs and outputs. If set, runs and
+        nums will be ignored
         tag : string to add in the output and data files.
         kwargs : Keyword arguments for RunSelector.
         """
@@ -152,7 +152,7 @@ class Plotter(Aggregator, BaseProcessor):
         # Select runs
         if selector is None:
             self.selector = RunSelector(
-                path, in_runs, in_nums, self.params.input.nml_filename, **kwargs
+                path, runs, nums, self.params.input.nml_filename, **kwargs
             )
         else:
             self.selector = selector
@@ -167,7 +167,7 @@ class Plotter(Aggregator, BaseProcessor):
             path,
             self.runs,
             self.nums,
-            path_out,
+            self.path_out,
             self.params,
             unit_time=unit_time,
             selector=self.selector,
@@ -305,7 +305,7 @@ class Plotter(Aggregator, BaseProcessor):
         if rule.kind == "snapshot" or rule.kind == "cells":
             run_num = [(run, num) for run in runs for num in nums[run]]
             if movie:
-                filenames = {run : [] for run in runs}
+                filenames = {run: [] for run in runs}
         elif rule.kind == "comp":
             run_num = [(None, None)]
             if movie:
diff --git a/snapshotprocessor.py b/snapshotprocessor.py
index 1f38b7e..73601cf 100644
--- a/snapshotprocessor.py
+++ b/snapshotprocessor.py
@@ -283,9 +283,9 @@ class SnapshotProcessor(HDF5Container):
 
     def __init__(
         self,
-        path=None,
+        path=".",
         num=None,
-        path_out=None,
+        path_out=".",
         params=None,
         tag=None,
         selector=None,
diff --git a/studyprocessor.py b/studyprocessor.py
index ea558d7..7d83eba 100644
--- a/studyprocessor.py
+++ b/studyprocessor.py
@@ -22,8 +22,8 @@ class StudyProcessor(Aggregator, HDF5Container):
     def __init__(
         self,
         path,
-        in_runs,
-        in_nums,
+        runs,
+        nums,
         path_out=None,
         params=default_params(),
         selector=None,
@@ -43,12 +43,12 @@ class StudyProcessor(Aggregator, HDF5Container):
         else:
             tag_name = ""
 
-        self.filename = path_out + "/comp" + tag_name + ".h5"
+        self.filename = self.path_out + "/comp" + tag_name + ".h5"
 
         # Select runs
         if selector is None:
             selector = RunSelector(
-                path, in_runs, in_nums, self.params.input.nml_filename, **kwargs
+                path, runs, nums, self.params.input.nml_filename, **kwargs
             )
 
         # Save infos
@@ -62,7 +62,7 @@ class StudyProcessor(Aggregator, HDF5Container):
 
         for run in self.runs:
             path_run = path + "/" + run
-            path_out_run = path_out + "/" + run
+            path_out_run = self.path_out + "/" + run
             self.snaps[run] = {}
 
             for num in self.nums[run]: