Yes, The 2 graphs offer the same information, although the ECDF Graph is somehow confusing. Is it the overplotting or overcrowding that makes the ECDF a bit confusing (as we add more data/info it becomes overcrowded), Dr Wicklin? I will consult if I have IML/Interactive Matrix Language problems. Yeah, I had problems with the Invertible matrics and finding the diagonal row\values during my Mathematical Modelling studies.