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Look at the supplied script plot_time_series.py as an example. It takes a GRIB file containing temperature data on multiple vertical levels for multiple time steps. The script plots a time series for each level for a given grid point.

Convert a GRIB field into text format

Create a new Grib to Geopoints icon. Edit it and drop one of the GRIB files into the Data box as shown.

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Executing this icon will convert the first GRIB field into Geopoints format. The result can be directly visualised, examined or saved to disk.