# cf.Field.insert_ref

`Field.``insert_ref`(item, key=None, axes=None, copy=True, replace=True)

  Insert a coordinate reference object into the field.

  See also

  `insert_axis`, `insert_aux`, `insert_measure`, `insert_data`, `insert_dim`

  Parameters: | item: `cf.CoordinateReference` The new coordinate reference object. key: `str`, optional The identifier for the item. By default a new, unique identifier will be generated. axes: optional Ignored copy: `bool`, optional If False then the item is not copied before insertion. By default it is copied. replace: `bool`, optional If False then do not replace an existing coordinate reference object of domain which has the same identifier. By default an existing coordinate reference object with the same identifier is replaced with item.
  Returns: | out: The identifier for the item.
  Examples: |

      >>>