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Identifies the experiment or model version.

expver=<value>

Each experiment or model run or research experiment is assigned a unique code ( version )number. Production Operational data is assigned 1 (or 2, and experimental data in Operations 11, 12 ), pre-operational test data ..., 75, 76,... and IFS research experiments run by ECMWF or by Member States have a four character experiment identifier.

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expver=1         # Operational data

expver=69       # IFS cycle 41r2 test data

expver=bd1f    # IFS research experiment bd1f

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