[gmx-users] cutting a cylinder from simulation box

[Sanku M]

Hi,
  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).
I wonder whether gromacs has any particular tool which can identify the particles within a cylindrical volume of a simulation box.
Thanks
Sanku
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