code: def _compute_cell_extents_grid(bounding_rect=(0.03, 0.03, 0.97, 0.97),
                                     num_rows=2, num_cols=6,
                                     axis_pad=0.01):
          
  
          left, bottom, width, height = bounding_rect
          height_padding = axis_pad * (num_rows + 1)
          width_padding = axis_pad * (num_cols + 1)
          cell_height = float((height - height_padding) / num_rows)
          cell_width = float((width - width_padding) / num_cols)
  
          cell_height_padded = cell_height + axis_pad
          cell_width_padded = cell_width + axis_pad
  
          extents = list()
          for row in range(num_rows - 1, -1, -1):
              for col in range(num_cols):
                  extents.append((left + col * cell_width_padded,
                                  bottom + row * cell_height_padded,
                                  cell_width, cell_height))
  
          return extents
docs: Produces array of num_rows*num_cols elements each containing the rectangular extents of
          the corresponding cell the grid, whose position is within bounding_rect.