Investigator B Magsat data, sorted into dawn and dusk, decimated FILE FORMAT DESCRIPTION read.me decinvb.f Conversion program pfilter.f Used to filter out main field, magnetospheric field, and ionospheric field, to leave only crustal anomaly field pfilter.jcl JCL driver for pfilter.f dawninvb.001 INVBDD RHE output duskinvb.001 INVBDD TAPES AND CARTRIDGES: XMEP09, DT0146, DT0228, DT0233, DT0248, DT0264, DT0265, DT0271, DT0272, DT0273