Selecting atoms in between the plane

Hi Friends,

I want to select atoms inside perticular plane (say 111 and 123 )

in order to get faceted nanoparticles. I am able to define the plane using,

Tools---> Miller Planes, but I don't understand how can I select perticular atoms

lying in these planes.

If any body has done this exersice before, please let me know.

Thanks

Himanshu

IISc Bangalore

India