hi, i want to calculate the angle between the two beeta sheet of a protein.for this reason i have made a index file containing two beeta sheet group.can anyone please suggest me how can i do this. i am using this command gmx gangle -f ../pbc340.xtc/md-340k-0-1 -s ../equilibration.gro -n b-1-3-sheet-p1.ndx -oav angle.xvg -dt 10 the error is Inconsistency in user input: Number of positions in selection 1 in the first group not divisible by 3
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