docs: def set_scalebar_for_all(self, row_column_list=None,
                               location='lower right'):
          """Show marker area scale for subplots.
  
          :param row_column_list: a list containing (row, column) tuples to
              specify the subplots, or None to indicate *all* subplots.
          :param location: the location of the label inside the plot.  May
              be one of 'center', 'upper right', 'lower right', 'upper
              left', 'lower left'.
  
          """
          if row_column_list is None:
              for subplot in self.subplots:
                  subplot.set_scalebar(location)
          else:
              for row, column in row_column_list:
                  subplot = self.get_subplot_at(row, column)
                  subplot.set_scalebar(location)