From: "John Sherman" 
To: 
Reply-To: "John Sherman" 






Hi Aditya,


> putting the same data into Foucault test analysis which works on the
> maths of Jim Burrows shows a 1/3.9 PV and 1/17.5 RMS Surface.
>
> Don't know what causes the discrepancy, from what I've heard; I feel
> figxp should be trusted more,
>
> What are your thoughts on this ?


My wild guess is that you are not using enough zones for final judgements.
Each program has to guess what you have between measured zones. With only a
few zones the programs are probably making different guesses on a large
amount of the mirror. Perhaps if you used twice as many zones the two
programs would merge?

I expect each program should be trusted equally.

John

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