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Returns a matrix that acts on a stretched pseudocontact shift density cube and projects out the values of the PCS at the Cartesian coordinates given. Tricubic interpolation is used. Syntax:



    cube_dims - PCS cube dimensions, ordered as [X Y Z].
    ranges    - cartesian axis extents for the pseudocontact shift 
                cube as [xmin xmax ymin ymax zmin zmax] in Angstroms.
    xyz       - nuclear coordinates as [x y z] with multiple rows) at
                which PCS is to be evaluated, in Angstroms.


    P        - matrix projecting out PCS values at the given positi-
               ons from the stretched PCS cube.

Note: this function is a part of the PCS inverse problem solver module and should not normally be called directly by the user.