code: def cc_diagram(cluster_name):
      
      x, y = get_hr_data(cluster_name)
      y_range = [max(y) + 0.5, min(y) - 0.25]
      pf = figure(y_range=y_range, title=cluster_name)
      _diagram(x, y, pf)
      show_with_bokeh_server(pf)
docs: Create a :class:`~bokeh.plotting.figure.Figure` to create an H-R
      diagram using the cluster_name; then show it.