Hi,

I’m trying to extract a list of frames from a long trajectory:

gmx trjconv -f complete.trr -s nvt.tpr -novel -ndec 14 -fr frames.ndx -pbc atom 
-o conf_test.gro -sep

where frames.ndx contains the following:

[ frames ]
2 3 4 5 6 8 ...

Each frame is supposed to be separated by 10 ps, so that for frame 2, t= 
20.0000. Hence, conf_test1.gro starts with "Generated by trjconv : Protein in 
water t=  20.00000”, which is what we expect. However, the timestamps in the 
subsequent files are:

Generated by trjconv : Protein in water t=  30.00000
Generated by trjconv : Protein in water t=  40.00000
Generated by trjconv : Protein in water t=  50.00000
Generated by trjconv : Protein in water t=  70.00000
Generated by trjconv : Protein in water t=  80.00000
…

while it should have been 30, 40, 50, 60, 80, .... This happens a lot of times 
throughout the whole list of frames. Why does it happen? How can I fix it?

Best,
Irem
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