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[Matthieu Verstraete <mjv500@york.ac.uk>]

All the LDA approximations are essentially the same, and fit the same QMC 
data (well, almost all). There are many more differences between the GGA 
parametrizations (PZ 91 vs PBE). Only ixc 1 and 7 LDAs are routinely used 
in abinit, but you may want to play around with 2 for your own purposes.

Matthieu

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Dr. Matthieu Verstraete                 mailto:mjv500@york.ac.uk
Dept. of Physics, University of York,     tel: +44 1904 43 22 08
Heslington, YO10 5DD York, United Kingdom fax: +44 1904 43 22 14