vice.milkyway.mode
==================

Type : ``str`` [case-insensitive]

Default : "ifr"

The interpretation of the attribute ``evolution``.

* 	mode = "ifr": The value returned from the attribute ``evolution``
	represents the surface density of gas infall into the interstellar
	medium in :math:`M_\odot kpc^{-2} yr^{-1}``.

* 	mode = "sfr": The value returned from the attribute ``evolution``
	represents the surface density of star formation in
	:math:`M_\odot kpc^{-2} yr^{-1}`.

* 	mode = "gas": The value returned from the attribute ``evolution``
	represents the surface density of the interstellar medium in
	:math:`M_\odot kpc^{-2}`.

.. note:: The attribute ``evolution`` will always be expected to accept
	radius in kpc and time in Gyr as the first and second parameters,
	respectively. However, infall and star formation histories will be
	interpreted as having units of :math:`M_\odot yr^{-1}` according
	to convention.

.. note:: Updating the value of this attribute also updates the
	corresponding attribute of the ``J21_sf_law`` star formation law
	where it has been assigned the attribute ``tau_star``.

Example Code
------------
>>> import vice
>>> mw = vice.milkyway(name = "example")
>>> mw.mode
"ifr"
>>> mw.mode = "sfr"
>>> mw.mode
"sfr"