docs: def plot_single_configuration(self, config_nr, sens_file):
          """
          plot sensitivity distribution with center of mass for
          a single configuration. The electrodes used are colored.
  
          Parameters
          ----------
          config_nr: int
              number of configuration
          sens_file: string, file path
              filename to sensitvity file
  
          """
          indices = elem.load_column_file_to_elements_advanced(
              sens_file, [2, 3],
              False,
              False
          )
  
          elem.plt_opt.title = ''
          elem.plt_opt.reverse = True
          elem.plt_opt.cbmin = -1
          elem.plt_opt.cbmax = 1
          elem.plt_opt.cblabel = r'fill'
          elem.plt_opt.xlabel = 'x (m)'
          elem.plt_opt.ylabel = 'z (m)'
  
          fig = plt.figure(figsize=(5, 7))
          ax = fig.add_subplot(111)
          ax, pm, cb = elem.plot_element_data_to_ax(
              indices[0],
              ax,
              scale='asinh',
              no_cb=False,
          )
          ax.scatter(
              self.sens_centers[config_nr, 0],
              self.sens_centers[config_nr, 1],
              marker='*',
              s=50,
              color='w',
              edgecolors='w',
          )
  
          self.color_electrodes(config_nr, ax)
  
          # Output
          sensf = sens_file.split('sens')[-1]
          sensf = sensf.split('.')[0]
          out = 'sens_center_' + sensf + '.png'
          fig.savefig(out, bbox_inches='tight', dpi=300)
          fig.clf()
          plt.close(fig)