Fix the problem

sohstationviewer/view/plotting/plotting_widget/plotting.py

@@ -79,6 +79,8 @@ class Plotting:
         # flatten point_list to be x
         x = [item for row in points_list for item in row]
         for points, c in zip(points_list, colors):
+            if c == '_':
+                continue
             ax.plot(points, len(points) * [0], linestyle="",
                     marker='s', markersize=2,
                     zorder=constants.Z_ORDER['DOT'],