Ensemble: Results: Add standard derivation to hydrogram plot.

src/View/Results/PlotHEnsemble.py

@@ -102,6 +102,7 @@ class PlotHEnsemble(PamhyrPlot):
                 return
 
             self.draw_data(res_id)
+            self.draw_data_std_derivation(res_id)
 
         self.canvas.axes.set_xlabel(
             self._trad["unit_time_s"],
@@ -159,6 +160,29 @@ class PlotHEnsemble(PamhyrPlot):
 
             self._line.append(line)
 
+    @timer
+    def draw_data_std_derivation(self, res_id):
+        results = self.results[res_id]
+        reach = results.river.reach(self._current_reach_id)
+
+        q = results.get("table")["q_mean"]
+        std_deriv = results.get("table")["q_std_derivation"]
+        profile = reach.profile(self._current_profile_id[0])
+
+        x = self._timestamps
+        y = q[:, profile.global_index]
+        std = std_deriv[:, profile.global_index]
+
+        y_b = y - std
+        y_t = y + std
+
+        plot = self.canvas.axes.fill_between(
+            x, y_b, y_t,
+            label=f"Standard derivation {profile.name}",
+            color=self.color_plot_ensemble_std_deriv,
+            alpha=0.3,
+        )
+
     def draw_additional_data(self, res_id):
         results = self.results[res_id]