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- between -49.26 Pa and 37.76 Pa for interpolation from an the N640 original reduced Gaussian grid to a 0.5°x0.5° regular latitude-longitude grid
- between -169.26 Pa and 146.26 Pa for interpolation from an the O12800 O1280 octahedral reduced Gaussian grid to a 0.5°x0.5° regular latitude-longitude grid
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