doc adjust

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Here is an example of writing a dump file the with the center-of-mass

(COM) for the chunk each atom is in:

(COM) for the chunk each atom is in.  The commands below can be added

to the bench/in.chain script.

compute         cmol all chunk/atom molecule

compute         com all com/chunk cmol

for properly.

Over time this applied force could shrink each polymer chain's radius

of gyration in a polymer mixture simulation.  Here is output after

adding the above lines to the bench/in.chain script.  The thermo

output is shown for 1000 steps, where the last column is the average

radius of gyration over all 320 chains in the 32000 atom system:

of gyration in a polymer mixture simulation.  Here is output from the

bench/in.chain script.  Thermo output is shown for 1000 steps, where

the last column is the average radius of gyration over all 320 chains

in the 32000 atom system:

compute         gyr all gyration/chunk cmol

variable        ave equal ave(c_gyr)