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Hi - The @MAX and @MIN transformations let you find the extreme values over some region or time range. I have a general suggestion, as you seem to be a new Ferret user. The first chapter of the Ferret Users guide will introduce you to the use of Ferret for various analyses; in particular the section called "Thinking like a Ferret" and the sections on transformations and expressions may help you get started with the kinds of analyses you want to do. See the list of topics in the introductory chapter, http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/introduction Ansley On 2/16/2012 3:01 AM, nitin patil wrote: Dear ferret users, |