*** For details on how to be removed from this list visit the *** *** CCP4 home page http://www.ccp4.ac.uk *** Dear All, I would like to fit a least square plane between two sets of co-ordinates and then calculate the angle between these planes. could anyone suggests a program to do this ? Thanks a lot S.Parthasarathy Molecular Biophysics Unit Indian Institute of Science Bangalore 560 012 India