Thanks to Melanie Pepper from OSU(Chemistry) we have first typo. The typo is in Part 3/3 of the Basis Set Intro series: Look for a string 6-311++G(2d1f,2p1d) and change it to 6-311+G(2d1f,2p1d) Sorry and thanks to Melanie for pointing it out. Jan Labanowski jkl -x- at -x- ccl.net, JKL -x- at -x- OHSTPY.BITNET ---