I put the code from Sebastian Kuhn and Nevzat Guler that calculates A1 and A2 from their fit to the world data. THe tar file is kuhn-guler-fit.tgz in directory /work/hallc/sane/jones/kuhn_guler_spin_structure_fit I have not tried and run it. Cheers, Mark -- Mark Jones 757-269-7733 jones at jlab.org