remove magic numbers

app.py

@@ -74,9 +74,12 @@ def server(input, output, session):
         else:
             split = False
 
+        min_temp = 15
+        max_temp = 35
+
         try:
             fig = show_two_plots(gdf_trees, f'simulated_temp_{value_trees}%', 'LST', 
-             15, 35, 'coolwarm',f"Temperature after treatment (+{value_trees}% Trees)",
+             min_temp, max_temp, 'coolwarm',f"Temperature after treatment (+{value_trees}% Trees)",
              "Original temperature",'Temperature (°C)',split=split)
             return fig
         except Exception as e:
@@ -89,9 +92,13 @@ def server(input, output, session):
     def temp_change():
         gdf_trees = get_gdf_trees()
         value_trees = input.tree_pct()
-        fig = show_one_plot(gdf_trees, f'treatment_effect_{value_trees}%', -2, 0, 'PuBu_r', 
-                  f"Decrease of temperature from treatment (+{value_trees}% Trees)", 
-                  "Temperature decrease (°C)")
+
+        most_temp_change = -2
+        no_temp_change = 0
+        
+        fig = show_one_plot(gdf_trees, f'treatment_effect_{value_trees}%', most_temp_change, no_temp_change, 
+        'PuBu_r', f"Decrease of temperature from treatment (+{value_trees}% Trees)", 
+        "Temperature decrease (°C)")
         return fig
     
     @output