Hi, Everybody!

This question is about the computation of charge density or charge density difference. This property can be computed [for a system like e.g. organic molecule adsorbed on a metal surface] either with DMol3 or CASTEP. However when we import isosurface, it appears at the lower and upper parts of the unit cell. Can anybody suggest how to remove the isosurface appearing at the upper part of the unit cell? Attached figure can more clearly illustrate the situation. The unwanted part (isosurface) in the attached figure is marked with the red square.

Thanks in advance!

Rana