code: def dimension_values(self, dim, expanded=True, flat=True):
          
          dim = self.get_dimension(dim, strict=True)
          if dim in self.vdims:
              return np.full(len(self), np.NaN)
          return self.interface.values(self, dim, expanded, flat)
docs: Return the values along the requested dimension.
  
          Args:
              dimension: The dimension to return values for
              expanded (bool, optional): Whether to expand values
                  Whether to return the expanded values, behavior depends
                  on the type of data:
                    * Columnar: If false returns unique values
                    * Geometry: If false returns scalar values per geometry
                    * Gridded: If false returns 1D coordinates
              flat (bool, optional): Whether to flatten array
  
          Returns:
              NumPy array of values along the requested dimension