There are currently five choices - avn, eta, meso, ngm, and ruc. The models must be in small letters. LVL - this is the level of the model you want to examine. As noted above, only mandatory level data is available in the AVN, every 50 mb in the NGM, Eta, and RUC, and every 25 mb for the meso-eta. June 1997 NGM model.
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