code: def legend_scaler(legend_values, max_labels=10.0):
      
      if len(legend_values) < max_labels:
          legend_ticks = legend_values
      else:
          spacer = int(math.ceil(len(legend_values)/max_labels))
          legend_ticks = []
          for i in legend_values[::spacer]:
              legend_ticks += [i]
              legend_ticks += ['']*(spacer-1)
      return legend_ticks
docs: Downsamples the number of legend values so that there isn't a collision
      of text on the legend colorbar (within reason). The colorbar seems to
      support ~10 entries as a maximum.