Shorten number format in histPlot

python/lsst/analysis/tools/actions/plot/histPlot.py

@@ -289,7 +289,7 @@ def makePlot(
             if nth_panel == 0 and nrows * ncols - len(self.panels) > 0:
                 nth_col -= 1
             # Set font size for legend based on number of panels being plotted.
-            legend_font_size = max(4, int(8 - len(self.panels[panel].hists) / 2 - nrows // 2))  # type: ignore
+            legend_font_size = max(4, int(7 - len(self.panels[panel].hists) / 2 - nrows // 2))  # type: ignore
             nums, meds, mads, stats_dict = self._makePanel(
                 data,
                 panel,
@@ -608,12 +608,16 @@ def _addStatisticsPanel(
         legend_labels = (
             ([""] * (len(handles) + 1))
             + [stats_dict["statLabels"][0]]
-            + [f"{x:.3g}" for x in stats_dict["stat1"]]
+            + [f"{x:.3g}" if x > 0.01 else f"{x:.2e}" for x in stats_dict["stat1"]]
             + [stats_dict["statLabels"][1]]
-            + [f"{x:.3g}" for x in stats_dict["stat2"]]
+            + [f"{x:.3g}" if x > 0.01 else f"{x:.2e}" for x in stats_dict["stat2"]]
             + [stats_dict["statLabels"][2]]
-            + [f"{x:.3g}" for x in stats_dict["stat3"]]
+            + [f"{x:.3g}" if x > 0.01 else f"{x:.2e}" for x in stats_dict["stat3"]]
         )
+        # Replace "e+0" with "e" and "e-0" with "e-" to save space.
+        legend_labels = [label.replace("e+0", "e") for label in legend_labels]
+        legend_labels = [label.replace("e-0", "e-") for label in legend_labels]
+
         # Set the y anchor for the legend such that it roughly lines up with
         # the panels.
         yAnchor = max(0, yAnchor0 - 0.01) + nth_col * (0.008 + len(nums) * 0.005) * legend_font_size