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The ROM SAF datasets can be retrieved using web-api from from the ECMWF public datasets service. web-api is a "programmatic approach" for data download with python scripts. The basic web-api documentation for accessing the data is given here.
General information related to downloading the data via on downloading with web-api , is described given here:
https://confluence.ecmwf.int/display/WEBAPI/Web-API+Downloads
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