# cf.CellMeasure.add_offset

`CellMeasure.``add_offset`

  The add_offset CF property.

  If present then this number is subtracted from the data prior to it being written to a file. If both `scale_factor` and `add_offset` properties are present, the offset is subtracted before the data are scaled. See http://cfconventions.org/latest.html for details.

  Examples: |

      >>> f.add_offset = -4.0
      >>> f.add_offset
      -4.0
      >>> del f.add_offset

      >>> f.setprop('add_offset', 10.5)
      >>> f.getprop('add_offset')
      10.5
      >>> f.delprop('add_offset')