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The files contain the observations that were used in the
inversions for the Global Dispersion Model GDM52.

The data set is described in the GDM52 paper:
Ekstrom, G., A global model of Love and Rayleigh 
surface-wave dispersion and anisotropy, 25-250 s,
Geophy. J. Int., doi:10.1111/j.1365-246X.2011.05225.x

There is a separate file for each period and wave type (L or R)
(see Table 1 the GDM52 paper).

Each line in the files contains one phase-anomaly observation. 
The columns are:

1. CMT event name
2. station code
3. earthquake latitude (geographic)
4. earthquake longitude
5. earthquake depth
6. station latitude (geographic)
7. station longitude
8. earthquake-to-receiver distance (km)
9. wave type (Love or Rayleigh, L or R) and orbit (1 or 2)
10. phase anomaly (radians) with respect to PREM prediction
11. 1/sigma where sigma is the estimate of uncertainty (see Table 2)
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GE 2011-10-25
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