The group velocity maps are presented as the percent deviation from
the average across each map. The average for each map in km/s follows.

Rayleigh:

20 s = 3.4853 km/s
30 s = 3.8152 km/s
40 s = 3.876 km/s
50 s = 3.8997 km/s
60 s = 3.894 km/s
70 s = 3.879 km/s
80 s = 3.8568 km/s
90 s = 3.833 km/s
100 s = 3.8076 km/s
125 s = 3.7527 km/s
150 s = 3.7013 km/s
175 s = 3.6648 km/s
200 s = 3.6336 km/s


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