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I used this command gmx hbond -f md_0_1.xtc -s md_0_1.tpr -n index.ndx -num hbnum.xvg for my analysis after creating an index file. However, I am getting strange numbers (Screenshot attached) when I open the hbnum.xvg and when I try to visualize the file on xmgrace, the graph is blank. My simulations were 1µs long.
