Hi,<br><br>please I'm trying to measure an hbond between 2 specific atoms. When I used g_hbond I didn't the result I expected because it doesn't specify the atoms that constitute the H bond.<br>Now I'm trying with g_dist but I encountered a problem: when I do the following in my index file:<br>
<br>r 172 & a HD2<br><br>it tells me: empty group<br><br>So please can anyone help me?<br><br>Thank you.<br>Carla<br>