I just noticed the following two issues in our ERDS maps example:

1. The last two plots include "ERDS (%)" as their y axes labels. I think this is not correct, since the ERDS values are not in %. There are two options: we can either convert ERDS values to %, or drop the "(%)" from the labels.
2. I am not sure why the last plot shows negative values up to about -2, because the minimum possible ERD value is -1 (-100%, meaning power during activity completely disappeared as compared to baseline). Is this a visualization artifact of the violin plots?

@eioe do you have time to take a look?