Multitaper method

[Francois]

@JoseLuis

You mean I cannot set the smoothing constant, say, 10 Hz or something?
So, if I set a modulation_factor of 10 what would do this? As a frequency increases the smoothing increases by a factor of 10, right?
So I guess what I could do is to restrict my analysis to a FOI of 70:2.5:100,
Then with a modulation_factor of 4 my smoothing would go from 15.5 to 25, is that correct?

Correct.
If you doubt about what is done in the computation, put a breakpoint at line 570 in bst_timefreq.m (click on the left of the line in the Matlab editor) before calling the process from the Brainstorm interface, then explore the contents of the variables.