def make_slabatm_axis(num_points=<NUM_LIT:1>):
depthax = Axis(axis_type='<STR_LIT>', num_points=num_points)<EOL>return depthax<EOL>
Convenience method to create a simple axis for a slab atmosphere.

    **Function-call argument** \n

    :param int num_points:   number of points for the slabatmosphere Axis [default: 1]
    :returns:               an Axis with ``axis_type='lev'`` and ``num_points=num_points``
    :rtype:                 :class:`~climlab.domain.axis.Axis`

    :Example:

        ::

            >>> import climlab
            >>> slab_atm_axis = climlab.domain.make_slabatm_axis()

            >>> print slab_atm_axis
            Axis of type lev with 1 points.

            >>> slab_atm_axis.axis_type
            'lev'

            >>> slab_atm_axis.bounds
            array([    0.,  1000.])

            >>> slab_atm_axis.units
            'mb'