On Wed, 2011-10-12 at 10:51 -0400, Zhiting Tian wrote: > I have met this problem before.Try to change "tetrahedra“ > to see whether it helps. it is not necessarily a problem, and it is unrelated to the usage of tetrahedra. P. -- Paolo Giannozzi, IOM-Democritos and University of Udine, Italy