Currently running Jmol which version? (clic after Jmol has loaded)

Slabbing

Slab Depth both
(slab from front) (slab from back) (move slab)
%
%

(rear percent which is visible) (rear percent which is hidden)  

 Gly Pro Hyp 

This page by Angel Herráez ; please, post comments on jmol-users mailing list