Michel PETITJEAN wrote: > Look to the freeware ASV: > http://petitjeanmichel.free.fr/itoweb.petitjean.freeware.html#ASV > http://petitjeanmichel.free.fr/itoweb.petitjean.spheres.html > Thank you so very much for the links. I will try them out and let you know whether they work fine for me. Until then. With kindest regards from Poland :) Stefek