minor fixes

src/sbmlsim/plot/plotting.py

@@ -798,8 +798,8 @@ class Figure(BasePlotObject):
 
     fig_dpi = 72
     fig_facecolor = "white"
-    fig_subplots_wspace = 0.15  # vertical spacing of subplots (fraction of axes)
-    fig_subplots_hspace = 0.15  # horizontal spacing of subplots (fraction of axes)
+    fig_subplots_wspace = 0.3  # vertical spacing of subplots (fraction of axes)
+    fig_subplots_hspace = 0.3  # horizontal spacing of subplots (fraction of axes)
     panel_width = 7
     panel_height = 5
     fig_titlesize = 25

src/sbmlsim/result/xresult.py

@@ -43,11 +43,18 @@ def __str__(self) -> str:
         """Get string."""
         return f"<XResult: {self.xds.__repr__()},\n{self.uinfo}>"
 
-    def dim_mean(self, key):
+    def dim_mean(self, key: str) -> xr.Dataset:
         """Get mean over all added dimensions."""
-        return self.xds[key].mean(
-            dim=self._redop_dims(), skipna=True
-        ).values * self.uinfo.ureg(self.uinfo[key])
+        try:
+            data = self.xds[key].mean(
+                dim=self._redop_dims(), skipna=True
+            ).values * self.uinfo.ureg(self.uinfo[key])
+        except KeyError as err:
+            logger.error(f"Key '{key}' does not exist in XResult. Add the "
+                         f"key to the experiment via add_selections in "
+                         f"'Experiment.datagenerators'.")
+            raise err
+        return data
 
     def dim_std(self, key):
         """Get standard deviation over all added dimensions."""