> Btw. @rgoj of cours this approach is perfectly valid, since we don't use a progredient succession of intervals. Also it's pretty simple + explicit -- sorry for over-reviewing. Still we could think about a window maker in utils.

OK, I'll stick with a list here for now. I do think at least here it's nice to be very explicit, esp. since this list of frequency bins is manually copied from a paper. Maybe later a window maker that could make me windows around a list of frequencies if I want to look at each and every frequency, that would be very useful here. But that's just something for much later if we deem it useful.