From: KIRTANA S (skirtana4_at_gmail.com)
Date: Mon Jul 18 2011 - 13:20:52 CDT

Dear all,

I am using a part of my script as below

set coord1 {}
set coord2 {}
lappend coord1 [measure center $sel1 weight mass]
lappend coord2 [measure center $sel2 weight mass]

Now I want to draw a line joining the center of mass of two selections
in graphics.

using

draw line [lindex $coord1 0] [lindex $coord2 0]

The the visualization of this does not connect the center of mass of
the selection instead it is on one coordinate atom.