On Tue, 19 Feb 2008, Tim Foden wrote: >> myCtest-AMAF is the final version ... I think it uses the 0.75 exponent. > Thanks. It seems to me that it may be worth trying 0.7 and 0.8 to see if > 0.75 is a maximum or not. As far as I remember I did that test ... and 0.75 turned out to be be best. Chrsitoph