[gmx-users] wrong distances with g_dist

[Dmytro Kovalskyy]

Hi,

I try to calculate distance between two atoms with g_dist. Somewhat I get 
distance lower than actual.
Here there are coordinates of the two atoms (PDB format)
 
ATOM    702  CZ  ARG X  45       5.930   9.230  41.740  0.00  0.00
ATOM   2751  CA  PHE X 177      41.710  45.000  27.180  0.00  0.00

And the distance I get from g_dist is 4.6260725 nm while the actual is 5.265 
nm.

What the problem can be?

Dmytro