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snapsample - select a subset particles in snapshot 
snapsample
in=in_file out=out_file [parameter=value] ... 
snapsample reads
the first snapshot(5NEMO)
 frame from in and copies a subset of the particles
to out.  The remaining particles are rescaled in mass so that the total
mass is unchanged. 
The following parameters are recognized: 
- in=in_file
- Input data is read from in_file.  Default: required. 
- out=out_file 
- Output
data is written to out_file.  Default: required. 
- nsamp=num_bodies 
- Number
of bodies written to output.  Should evenly divide the number in the input
file.  Default: 32. 
- offset=body_offset 
- Specify origin for periodic sampling
of body array.  Default: 0. 
- besort=sort_flag 
- If set, sort particles by binding
energy before sampling.  Input data must include Potential item.  Default:
false. 
snapmask(1NEMO)
, snaptrim(1NEMO)
, snapshot(5NEMO)
 
At
some point, we should merge this program with snapmask. 
Joshua E. Barnes
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