[xcrysden] Isovolume option on xcrysden's isosurface/property-plane controls panel.

[Hongyi Zhao]

Hi,

I'm reading the wannier90's solution booklet from here:

https://github.com/wannier-developers/wannier90/blob/2f4aed6a35ab7e8b38dbe196aa4925ab3e9deb1b/doc/solution_booklet/Example1.tex#L60


It told the following options for using xcrysden to plot the wannier functions:

Degree of triCubic Spline = 3;
Isovolume = 0.95;
Render +/- isovalue = yes

But I really cannot find the `Isovolume' option, instead, only the
`Isovalue' option existed on the xcrysden's isosurface/property-plane
controls panel.

Any hints for this problem?
-- 
Hongyi Zhao <hongyi.zhao at gmail.com>