Data files structure:
 1. Longitude
 2. Latitude
 3. Depth (meters)
 4. Standard Deviation for Depth
 5. Number of Profiles for Depth
 6. Salinity (PSU)
 7. Standard Deviation for Salinity
 8. Number of Profiles for Salinity
 9. Potential Temperature (degC)
10. Standard Deviation for Potential Temperature
11. Number of Profiles for Potential Temperature
12. dSigma/dZ (kg/m4)
13. Standard Deviation for dSigma/dZ
14. Number of Profiles for dSigma/dZ
15. Montgomery Potential Anomaly relative to 0 dbar (dynamic meters)
16. Standard Deviation for Montgomery Potential Anomaly relative to 0 dbar
17. Number of Profiles for Montgomery Potential Anomaly relative to 0 dbar
18. Spiciness
19. Standard Deviation for Spiciness
20. Number of Profiles for Spiciness
21. Montgomery Potential (dynamic meters)
22. Standard Deviation for Montgomery Potential
23. Number of Profiles for Montgomery Potential

Aviso altimetry(*) referred to MDT_CNES-CLS09(**) was used
to calculate Montgomery Potential.

(*) The altimeter products were produced by Ssalto/Duacs
and distributed by Aviso, with support from Cnes
(http://www.aviso.oceanobs.com/duacs/).

(**) MDT_CNES-CLS09 was produced by CLS Space Oceanography Division
and distributed by Aviso, with support from Cnes
(http://www.aviso.oceanobs.com/).