correct the way to identify colors for mass pos

sohstationviewer/view/plotting/plotting_widget/plotting.py

@@ -385,18 +385,16 @@ class Plotting:
             colors = [None] * len(y)
             sizes = [1.5] * len(y)
             for i in range(len(y)):
-                count = 0
-                prev_v = 0
+                count = -1
                 for v, c in value_colors:
-                    if count < (len(value_colors) - 1):
-                        if prev_v < abs(y[i]) <= v:
+                    count += 1
+                    if count <= len(value_colors) - 2:
+                        if abs(y[i]) <= v:
                             colors[i] = clr[c]
                             break
                     else:
+                        # The last value color
                         colors[i] = clr[c]
-                        break
-                    prev_v = v
-                    count += 1
             ax.scatter(x, y, marker='s', c=colors, s=sizes,
                        zorder=constants.Z_ORDER['DOT'])
         ax.x_list = x_list