py:class optional
py:obj numpy.datetime64
py:class file object
py:class function
py:obj function
py:class any type
py:class Unit('pix')
py:class Unit('deg')
py:class Unit('arcsec')
py:class Unit('%')
py:class Unit('s')
py:class Unit('Angstrom')
py:class Unit('arcsec / pix')
py:class Unit('W / m2')
py:class array-like
py:obj parfive
py:class string
py:class floats
