diff --git a/snapshotprocessor.py b/snapshotprocessor.py
index 217bd41..2ce2a36 100644
--- a/snapshotprocessor.py
+++ b/snapshotprocessor.py
@@ -399,6 +399,7 @@ class SnapshotProcessor(HDF5Container):
             self.num,
             order=self.params.pymses.order,
             verbose=self.params.pymses.verbose,
+            check_endianness=False,
         )
         self._amr = self._ro.amr_source(self.params.pymses.variables)
         self._part = self._ro.particle_source(self.params.pymses.part_variables)
@@ -460,7 +461,7 @@ class SnapshotProcessor(HDF5Container):
             ax_v = self._axes_v[ax_los]
             real_ax = ax_los
             if real_ax == "y":
-                real_ax = [0, -1, 0] # we look from -y to keep z upwards
+                real_ax = [0, -1, 0]  # we look from -y to keep z upwards
 
             self._cam[ax_los] = Camera(
                 center=self.params.pymses.center,
@@ -1614,10 +1615,10 @@ class SnapshotProcessor(HDF5Container):
                     "vy": "unit_velocity",
                     "vz": "unit_velocity",
                     "rot_period": "unit_time",
-                    "lx": {"unit_mass" : 1, "unit_length" : 2, "unit_time" : -1},
-                    "ly": {"unit_mass" : 1, "unit_length" : 2, "unit_time" : -1},
-                    "lz": {"unit_mass" : 1, "unit_length" : 2, "unit_time" : -1},
-                    "acc_rate": {"unit_mass" : 1, "unit_time" : -1},
+                    "lx": {"unit_mass": 1, "unit_length": 2, "unit_time": -1},
+                    "ly": {"unit_mass": 1, "unit_length": 2, "unit_time": -1},
+                    "lz": {"unit_mass": 1, "unit_length": 2, "unit_time": -1},
+                    "acc_rate": {"unit_mass": 1, "unit_time": -1},
                     "acc_lum": U.none,
                     "age": U.year,
                     "int_lum": U.none,
@@ -1627,8 +1628,8 @@ class SnapshotProcessor(HDF5Container):
                     "tform": "unit_time",
                     "del_mass": U.Msun,
                     "rho_gas": "unit_density",
-                    "cs**2": {"unit_velocity" : 2},
-                    "etherm": {"unit_mass" : 1, "unit_velocity" : 2},
+                    "cs**2": {"unit_velocity": 2},
+                    "etherm": {"unit_mass": 1, "unit_velocity": 2},
                     "vx_gas": "unit_velocity",
                     "vy_gas": "unit_velocity",
                     "vz_gas": "unit_velocity",