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John, > What is the def "lg(re (1e-6 m)^3)", symbol Bz, listed under volume in > udunits2-common.xml? It's a stumper. A "Bz" is the base unit for "dBz", which is a logarithmic unit for measuring atmospheric radar reflectivity. A value of 0 dBz (or 0 Bz, for that matter) corresponds to a cubic micron). A value of 60 dBz (6 Bz) corresponds to very heavy rain. Regards, Steve Emmerson Ticket Details =================== Ticket ID: VSN-760181 Department: Support UDUNITS Priority: Normal Status: Closed