docs: def _cas_4(self):
          ''' Longitude/Lagitude overlap (4 images) '''
  
          lonc_left = self._format_lon(self.lonm)
          lonc_right = self._format_lon(self.lonM)
          latc_top = self._format_lat(self.latM)
          latc_bot = self._format_lat(self.latm)
  
          img_name_00 = self._format_name_map(lonc_left, latc_top)
          img_00 = BinaryTable(img_name_00, self.path_pdsfiles)
          X_00, Y_00, Z_00 = img_00.extract_grid(self.lonm,
                                                 float(
                                                     img_00.EASTERNMOST_LONGITUDE),
                                                 float(img_00.MINIMUM_LATITUDE),
                                                 self.latM)
  
          img_name_01 = self._format_name_map(lonc_right, latc_top)
          img_01 = BinaryTable(img_name_01, self.path_pdsfiles)
          X_01, Y_01, Z_01 = img_01.extract_grid(float(img_01.WESTERNMOST_LONGITUDE),
                                                 self.lonM,
                                                 float(img_01.MINIMUM_LATITUDE),
                                                 self.latM)
  
          img_name_10 = self._format_name_map(lonc_left, latc_bot)
          img_10 = BinaryTable(img_name_10, self.path_pdsfiles)
          X_10, Y_10, Z_10 = img_10.extract_grid(self.lonm,
                                                 float(
                                                     img_10.EASTERNMOST_LONGITUDE),
                                                 self.latm,
                                                 float(img_10.MAXIMUM_LATITUDE))
  
          img_name_11 = self._format_name_map(lonc_right, latc_bot)
          img_11 = BinaryTable(img_name_11, self.path_pdsfiles)
          X_11, Y_11, Z_11 = img_11.extract_grid(float(img_11.WESTERNMOST_LONGITUDE),
                                                 self.lonM,
                                                 self.latm,
                                                 float(img_11.MAXIMUM_LATITUDE))
  
          X_new_top = np.hstack((X_00, X_01))
          X_new_bot = np.hstack((X_10, X_11))
          X_new = np.vstack((X_new_top, X_new_bot))
  
          Y_new_top = np.hstack((Y_00, Y_01))
          Y_new_bot = np.hstack((Y_10, Y_11))
          Y_new = np.vstack((Y_new_top, Y_new_bot))
  
          Z_new_top = np.hstack((Z_00, Z_01))
          Z_new_bot = np.hstack((Z_10, Z_11))
          Z_new = np.vstack((Z_new_top, Z_new_bot))
  
          return X_new, Y_new, Z_new