Gzipped group velocity maps are in gpvel_jeannot.tar

To extract:

tar xvf gpvel_jeannot.tar
gzip *.gz

Rayleigh wave maps are named like RG_40 for the 40 sec
Rayleigh wave map and LG_40 for the 40 sec Love wave map.

Files are ascii flat files: lon, lat, gpvel (km/sec)

Some information about map quality can be found using 
path density files.

To extract:

tar xvf pd_jeannot.tar
gzip *.res.gz

Format: lon, lat, path_density (paths per 2 deg x 2 deg cell)

Buyer beware if the path density goes much below about
50 paths per 2x2 cell.

The reference is:

Ritzwoller, M.H., N.M. Shapiro, M.P. Barmin, and A.L. Levshin, 
Global surface wave diffraction tomography, J. Geophys. Res., 
107(B12), 2335, 2002.