Compute the eigenfrequency and eigenfunction of your choice The FORTRAN program used for the calculation of the modes is MINOS and was mostly written by Freeman Gilbert and Guy Masters, IGPP, SIO, UCSD, La Jolla, California. You can get your own copy of the programs from them (gmasters@ucsd.edu). Select an Earth model: 1066A (Gilbert and Dziewonski, 1975) 1066B (Gilbert and Dziewonski, 1975) PREM (Dziewonski and Anderson, 1981) CORE11 (Widmer, Masters and Gilbert, 1988) Select the type of mode you want: S (spheroidal) T (toroidal) R (radial) Overtone number n (0<=n<50): Angular Order l (0<=l<200):