Weird looking visualisation when projecting FOOOF output on cortex

@Luc @Raymundo.Cassani : Anything new on this end? I would want to visualize fooof results on cortex, but run into similar problems. Also seems as if there is still an issue with power vs. log power values when visualizing (see also: Parameterised PSD Showing Higher Values When Compared To Non-Parameterised PSDs?)

Thanks for your help, Bahne