Data files structure:
 1. Longitude
 2. Latitude
 3. Zonal Velocity (cm/s)
 4. Standard Deviation for Zonal Velocity
 5. Number of Profiles for Zonal Velocity
 6. Meridional Velocity (cm/s)
 7. Standard Deviation for Meridional Velocity
 8. Number of Profiles for Meridional Velocity
 9. Velocity Magnitude (cm/s)
10. Standard Deviation for Velocity Magnitude
11. Number of Profiles for Velocity Magnitude