[gmx-users] folding of coordinates in trajectory files

[Gavin Melaugh]

Hi All

I was wondering. I assume gromacs writes folded coordinates in the
trajectory files. If so
does it use

rx(i) = rx(i) -boxl *nint(rx(i) / boxl)

to fold the coordinates at each step?
and where does it define the origin (0,0,0)
Cheers

Gavin