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Note
  1. For NetCDF output on ECMWF's Web API, or if you intend to convert to NetCDF with ecCodes, you have to retrieve data on a regular lat/lon grid.
  2. The behaviour described above applies to data retrievals through ECMWF's  Web API or MARS client. Data retrievals from the Climate Data Store (CDS) use ECMWF's interpolation tool MIR, which by default interpolates the land-sea mask to fractional values, including for regular lat/lon grids.
  3. The ERA5 land-sea mask provided is not suitable for direct use with wave parameters. In order to produce a land-sea mask for use with wave parameters on a regular lat/lon grid, please have a look under the Guidelines in the ERA5 documentation.

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