General information:   https://ifg.tugraz.at/downloads/ocean-tides
Format description at: https://ftp.tugraz.at/outgoing/ITSG/oceanAndAtmosphericTides/README.pdf

When using the data, please cite:
Savcenko R., Bosch W., Dettmering D., Seitz F.:
EOT11a - Global Empirical Ocean Tide model from multi-mission satellite altimetry,
with links to model results. Deutsches Geodätisches Forschungsinstitut,
Munich, 10.1594/PANGAEA.834232, 2012 (Open Access)

Reference publication:
Savcenko R., Bosch W.: EOT11a - Empirical Ocean Tide Model from Multi-Mission Satellite Altimetry.
Deutsches Geodätisches Forschungsinstitut, Munich, Report No 89, 49 pp, hdl:10013/epic.43894.d001, 2010.

Converted into spherical harmonics by Torsten Mayer-Guerr, Daniel Rieser