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Hi Jamie & All, Feb 16, 2007 In my original post of Feb 8, I stated-- "As a rule of thumb, a 5 cm difference from sea level would represent an elevation difference of about 3.9 metres." This should have read 'about 39 metres'. I apparently went from a spreadsheet value of 3934.9 cm, transposed this to the e-mail as 3.9 metres and never looked back. This correction does extend the possible elevation range, e.g. an h of 40 cm from sealevel would represent an elevation of 320.3 M. Yt, DW
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