code: def cell_nodes_y(self):
          
          decoder = self.decoder
          ycoord = self.ycoord
          data = self.data
          ybounds = decoder.get_cell_node_coord(
              data, coords=data.coords, axis='y')
          if self.plotter.convert_radian:
              ybounds = convert_radian(ybounds, ycoord, ybounds)
          return ybounds.values
docs: The unstructured y-boundaries with shape (N, m) where m > 2