Anirban, Exactly.. That's the gap (either side of the leaflets) I was mentioning about. I'll try EM and check itagain. Thanks. -- View this message in context: http://gromacs.5086.n6.nabble.com/GPCR-MD-Tutorial-Using-GROMACS-URL-tp4930034p4933996.html Sent from the GROMACS Users Forum mailing list archive at Nabble.com.