[gmx-users] about pulling

[zzhwise1]

everyone 
     i want to do the afm on my system,i want to pull one of my two monolayers and keep the other  one still,i only have a pull.ppa as input file,but it show input/output error pull.ndx! does that for no pull.ndx file?
   anyone can tell me how to do afm?
thanks advanced!
 
 
 
 
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