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To help users to improve S2S CMA MARS requests performance via the WebAPIIf a user is interested only on z500,  he may request more HindcastDates in one go, since the overall request will not be so bigWebAPI.

A good understanding of the MARS efficiency issues is essential especially for users that are interested in downloading large amounts of data.

for HindcastDate in HindcastDate-list (eg, 2010-03-01 to 2010-03-31)
     S2S-request(HindcastDate)

Have You may wish to have a look on some CMA re-forecast examples or on to visit the ECMWF Web API Home