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:
FES2014 was produced by Noveltis, Legos and CLS and distributed by Aviso+,
with support from Cnes (https://www.aviso.altimetry.fr/)

Converted into spherical harmonics by Torsten Mayer-Guerr