[PyMOL] electron density map

Dear all,
  I have to show the electron density at two different positions in the structure, wheree two residues are interacting.I have made the object.I load the 2fofc.xplor.and given the isomesh m1,map1,1.0,(A.......),carve=2.0.I can select either the whole chainA or a particular residue,it shows the Electron density map.But,how can I get the density at two different residues which are apart from each other coming closer in 3D structure,and interacting.
  All suggestions are welcome.Thanx in advance.
  Shivesh Kumar 


shivesh
       
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