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ECMWF provides and supports ecCodes. This software package has an Application Program Interface which makes ECMWF GRIB1 and GRIB2 files accessible from C, FORTRAN and Python programmes. ecCodes also provides a useful set of command line tools to give quick access to GRIB messages within the files.

Metview is a software tool from ECMWF which allows users to read, process and visualise GRIB 1 and GRIB 2 data (see Metview documentation).

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Please be aware that when reading GRIB files where the range of valid data values includes '9999' that some software may incorrectly indicate that these data points are missing. This is because 9999 is the default missing value indicator. 

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