Don't make unnecessary copy

mne-tools · Feb 4, 2025 · e243310 · e243310
1 parent 5108607
commit e243310
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/mne/viz/evoked_field.py b/mne/viz/evoked_field.py
@@ -279,8 +279,8 @@ def _prepare_surf_map(self, surf_map, color, alpha):
         current_data = data_interp(self._current_time)
 
         # Make a solid surface
-        surf = deepcopy(surf_map["surf"])
         if self._units == "mm":
+            surf = deepcopy(surf_map["surf"])
             surf["rr"] *= 1000
         map_vmax = self._vmax.get(surf_map["kind"])
         if map_vmax is None: