You want to dump a specific section of a GRIB message rather than all its sections.
Step-by-step guide
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To find out the sections and their contents of each edition, see here:
- GRIB edition 1 sections
- GRIB edition 2 sections
For example let's look at the Grid Description Section of a GRIB 1 file. This would be Section 2 for edition 1 so we use the key "section_2":
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