[gmx-users] question about g_density

[jhosamelly]

I'm doing the Martini Bilayer tutorial. Now, I'm trying to compute the
bilayer thickness so I used the command

make_ndx -f confout.gro -o index.ndx

to make an index for P*

then I used 

g_density -f confout.gro -n index.ndx -o martini.xvg

I looked at the graph and it's fine.

but, when I tried doing it without specifying the input file

g_density -n index.ndx -o martini.xvg

it gives me a different graph. 

I'm just wondering, what input file does g_density use when you don't
specify the input file?

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