code: def plot_pseudodepths(configs, nr_electrodes, spacing=1, grid=None,
                        ctypes=None, dd_merge=False, **kwargs):
      pseudo_d_functions = {
          'dd': _pseudodepths_dd_simple,
          'schlumberger': _pseudodepths_schlumberger,
          'wenner': _pseudodepths_wenner,
      }
      titles = {
          'dd': 'dipole-dipole configurations',
          'schlumberger': 'Schlumberger configurations',
          'wenner': 'Wenner configurations',
      }
      only_types = ctypes or ['dd', ]
      results = fT.filter(configs, settings={'only_types': only_types, })
      figs = []
      axes = []
      for key in sorted(results.keys()):
          print('plotting: ', key)
          if key == 'not_sorted':
              continue
          index_dict = results[key]
          if key == 'dd' and not dd_merge:
              plot_list = []
              labels_add = []
              for skip in sorted(index_dict.keys()):
                  plot_list.append(index_dict[skip])
                  labels_add.append(' - skip {0}'.format(skip))
          else:
              plot_list = [np.hstack(index_dict.values()), ]
              print('schlumberger', plot_list)
              labels_add = ['', ]
          grid = None
          for indices, label_add in zip(plot_list, labels_add):
              if len(indices) == 0:
                  continue
              ddc = configs[indices]
              px, pz = pseudo_d_functions[key](ddc, spacing, grid)
              fig, ax = plt.subplots(figsize=(15 / 2.54, 5 / 2.54))
              ax.scatter(px, pz, color='k', alpha=0.5)
              if grid is not None:
                  electrodes = grid.get_electrode_positions()
                  ax.scatter(
                      electrodes[:, 0],
                      electrodes[:, 1],
                      color='b',
                      label='electrodes', )
              else:
                  ax.scatter(
                      np.arange(0, nr_electrodes) * spacing,
                      np.zeros(nr_electrodes),
                      color='b',
                      label='electrodes', )
              ax.set_title(titles[key] + label_add)
              ax.set_aspect('equal')
              ax.set_xlabel('x [m]')
              ax.set_ylabel('x [z]')
              fig.tight_layout()
              figs.append(fig)
              axes.append(ax)
      if len(figs) == 1:
          return figs[0], axes[0]
      else:
          return figs, axes