# cf.ATOL

`cf.``ATOL`(*arg)

  The value of absolute tolerance for testing numerically tolerant equality.

  See also

  `cf.RTOL`

  Parameters: | arg : int, optional The new value of absolute tolerance. The default is to not change the current value.
  Returns: | out: `float` The value prior to the change, or the current value if no new value was specified.
  Examples: |

      >>> cf.ATOL()
      1e-08
      >>> old = cf.ATOL(1e-10)
      >>> cf.ATOL(old)
      1e-10
      >>> cf.ATOL()
      1e-08