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blaylockbk committed Feb 23, 2022
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🪂 Subset with ``searchString``
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Subsetting is done using the GRIB2 index files. Index files define the grib variables/parameters of each message (sometimes it is useful to think of a grib message as a "layer" of the file) and define the byte range of the message.

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``"^TMP:2 m.*fcst$"`` Beginning of string (^), end of string ($) wildcard (.*)
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.. hint:: The NCEP `Parameters & Units Table <https://www.nco.ncep.noaa.gov/pmb/docs/on388/table2.html>`_ is a useful resource to help you identify GRIB variable abbreviations and their meanings.
.. hint:: The NCEP `Parameters & Units Table <https://www.nco.ncep.noaa.gov/pmb/docs/on388/table2.html>`_ is a useful resource to help you identify wgrib2-style GRIB variable abbreviations and their meanings.

ecCodes-style index files
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":pp1d:" Peak wave period
":mp2:" Mean zero-crossing wave period
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.. hint:: The ECMWF `Parameter Database <https://apps.ecmwf.int/codes/grib/param-db?filter=grib2>`_ is a useful resource to help you identify ecCodes-style GRIB variable abbreviations and their meanings.

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