Hi, How does PWSCF handle the number of planewaves during a variable-cell optimizations? Are the planewaves or energy cutoff kept constant? Does it use the method of Bernasconi et. al Phys. Chem. Solids, 56 501 (1995)? Thanks, -- Dr. Nichols A. Romero, PhD. 1613 Denise Dr. Apt. D Forest Hill, MD 21050 443-567-8328 (C) 410-306-0709 (O)