Hi Kanika and Tsjerk,

if you use the commands below:

pseudoatom coms, chain  a
pseudoatom coms, chain b
bond coms, coms

you create the center of geometry rather than the center of mass.
I'd like to know how to create the center of mass.

Alternatively you can use the command distance to draw a line between 2 points 
or selections,
distance name,pointA,pointB


Hope it helps,

Cunliang
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