I’m trying to work out a way to create a difference topomap to visualize the difference between two conditions. I.e., I want to plot the topomap of condition 1 - condition 2 for an average of 150-250ms, 300-500ms and 600-800ms. I thought the easiest way to do this would be via getting the data from each evoked object, subtracting them and creating a new evoked object with EvokedArray. Unfortuantely, I haven’t managed to find a way to do this! Any help is appreciated.