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Sue, > Where do you get the "system" Typically from "ut_read_xml(NULL)". See <http://www.unidata.ucar.edu/software/udunits/udunits-2/udunits2lib.html#Obtaining>. > Are there some predefined "system" files that come > with UDUNITS2 One very large unit system comes with the UDUNITS-2 package. You can create your own or add units to the default one. Be aware, however, that any modifications will make your unit system incompatible, to some extent, with the default one. Regards, Steve Emmerson Ticket Details =================== Ticket ID: JLQ-522131 Department: Support UDUNITS Priority: Normal Status: Closed