# cf.CellMethods.over

`CellMethods.``over`

  Each cell method’s over keyword.

  These describe how climatological statistics have been derived.

  See also

  `within`

  Examples: |

      >>> c = cf.CellMethods('time: minimum area: mean')
      >>> c
      <CF CellMethods: time: minimum time: mean>
      >>> c.over
      [None, None]
      >>> c[0].within = 'years'
      >>> c[1].over = 'years'
      >>> c.over
      >>> [None, 'years']
      >>> c
      <CF CellMethods: time: minimum within years time: mean over years>
      >>> d = c[1]
      >>> d
      <CF CellMethods: time: mean over years>
      >>> del d.over
      >>> d.over
      [None]
      >>> d
      <CF CellMethods: time: mean>
      >>> del c[0].within
      >>> c.within
      ()
      >>> c
      <CF CellMethods: time: minimum time: mean>