Update a magic number?

[guanhuaw]

Hi Jon and Steven, in the N/2 ghosting correction code line 79, the mask level 0.1 is sometimes too high. I acquired a set of fully-sampled data, and 0.01 worked. Not sure if there is a rule-of-thumb to decide this number? Thanks!

[jfnielsen]

Good catch. Perhaps it's better to have the caller supply a mask, will address this...