Hi, I am trying to understand the GAPW method as described in the article: Theor. Chem. Acc (1999) 103:124-140 The basic idea is to reduce the amount of work performed in calculating E^H[n(r)] and E^XV[n(r)] by decomposing the density into soft and hard contributions, i.e. n = \tilde{n} - \tilde{n}^1 + n^1 This methods can be applied using AE or PP approach. Though applying GAPW with PP would be more common. Is this method really more like PAW (Bloechl et. al) or is more like an US-PP approach? For example, GAPW with PP has a frozen core and it would not be possible to use it an relax-core PAW type of method? Thanks and pardon my ignorance. -- Nichols A. Romero, Ph.D . 1613 Denise Dr. Apt. D Forest Hill, MD 21050 443-567-8328 (C) 410-306-0709 (O)