SMD output files and interpretation

GROMACS version: 2023-plumed_2.9.0
GROMACS modification: No

Hello,

I have been working on some SMD’s and noticed that my pullf.xvg and pullx.xvg files have different lengths. I am not sure what can be causing this, considering that I am using the default values for nstxout and nstfout. Does someone has an idea on what can be the issue?

In the same note, how should I interpret the values in the pullx file, is it the separation between the two pulling groups I have defined?

Thanks in advance!