Hi All, Still it is not clear for me what's the meaning of "nm\S-3\N". Can any one help me out? What is "S-3" and what is "N"? Thanks, Dariush -- View this message in context: http://gromacs.5086.x6.nabble.com/Number-Density-tp5011185p5013952.html Sent from the GROMACS Users Forum mailing list archive at Nabble.com.