This is the first release of m3csdirest (Multiple 3-Component Station DIRection ESTimate)
m3csdirest is a FORTRAN77 program which requires the SAC library, LAPACK, and BLAS.
I obtained SAC (the seismic analysis code) from
https://ds.iris.edu/ds/nodes/dmc/software/downloads/sac/
The latest version of m3csdirest is available from
https://github.com/stevenjgibbons/m3csdirest