And , uh , I mean , fundamentally they 're the same sort of thing but the math is a little different so that there 's a  a   there 's an exponent difference in the index  you know , what 's the ideal filtering , and depending on how you construct the problem.
Uh - huh.
And , uh , I guess it 's sort  you know , after  after that meeting it sort of made more sense to me because  um , if you 're dealing with power spectra then how are you gonna choose your error ? And typically you 'll do  choose something like a variance. And so that means it 'll be something like the square of the power spectra. Whereas when you 're  when you 're doing the  the , uh , um ,  looking at it the other way , you 're gonna be dealing with signals
Mm - hmm.