docs: def set_colorbar(self, label='', horizontal=False):
          """Show the colorbar, it will be attached to the last plot.
  
          Not for the histogram2d, only for the scatter_table.
          Global mlimits should be set for this to properly reflect the
          colormap of each subplot.
  
          :param label: axis label for the colorbar.
          :param horizontal: boolean, if True the colobar will be horizontal.
  
          """
          if self.limits['mmin'] is None or self.limits['mmax'] is None:
              warnings.warn('Set (only) global point meta limits to ensure the '
                            'colorbar is correct for all subplots.')
          self.colorbar = {'label': label,
                           'horizontal': horizontal}