I dont know if it would be of any help but there's a zippd excel
spreadsheet (phase.zip) on the downloads page of my website that may
be of use, it was constructed for working on linearising phase control
for lighting dimmers and includes the generation of lookup tables and
may contain what you want...

Cheers

-- 

Andy B.

http://www.abtec.demon.co.uk

SBN Level 2 Member

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"How can I tell that the past isn't a fiction designed to
account for the discrepancy between my immediate physical
senstaions and my state of mind....."
------------------------------------------- Douglas Adams