|Main Table of Contents||VERSION 4.6|
|GROMACS homepage||Sat 19 Jan 2013|
First the group name is written between square brackets. The following atom numbers may be spread out over as many lines as you like. The atom numbering starts at 1.
An example file is here:
[ Oxygen ] 1 4 7 [ Hydrogen ] 2 3 5 6 8 9There are two groups, and total nine atoms. The first group Oxygen has 3 elements. The second group Hydrogen has 6 elements.
An index file generation tool is available: make_ndx.