[gmx-users] constraints bond length vari by 10%

[Sebastian Waltz]

Hi all,

I added constraints on some bonds in my system by adding 

[ constraints ]
;ai   	aj	type	distance
   40	41	1	0.1230
   47	48	1	0.1230
   54	55	1	0.1230
   61	62	1	0.1230

to me top file (CO double bonds) and in the mdp file 

constraints         =  none

. I thought this should more or less fix my bond lengths.
Nether the less the bond lengths vary by 10%. Did I make
something or is it quite normal? What would be the way to
fix the bond length so that they vary only by ca. 1%.

Thanks