<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>Hi,</div><div> I have run a simulation of a fixed object in water using gromacs. Now, I want to analyze only water molecules which are present within a cylinder of certain radius (smaller than simulation box dimension in XY plane).</div><div>I wonder whether gromacs has any particular tool which can identify the particles within a cylindrical volume of a simulation box.</div><div>Thanks</div><div>Sanku</div></div></body></html>