Try the following link - http://www.canford.co.uk/techsupport/metawg.htm - it may help you. Regards, Richard, www.vantageaudio.com
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Thanks Vantageaudio and Citation! What a great forum, to be able to get accurate information on an abstruse topic like this, and within a few hours. I now know what I need to know. I guess the cross sections for the series of gauges were set in such a way that doubling any of them matched the one three steps down, so that combining two gauge X's yields gauge X-3, wherever X happens to be in the series. I'm grateful for your help.