Hmm.
Uh , we had a long discussion about how they were the same and how they were d uh , completely different.
Mm - hmm.
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.