Sorry, this time with attachment :).

Hi freesurfer experts,

I am trying to correct the pial surfaces of my data. I was able to remove voxels with the right button of my mouse, but unfortunately, it didn't work out to add voxels. Can somebody please help me with that? Do I need a middle button on the mouse for it?

Attached you may find a slice of the brain data. The red line (indicating the pial surface) and green line (indicating the grey matter/white matter boundary) cross, which should not happen in my opinion. Is there any possibility to change the lines so that they don't cross anymore?

Cheers, Julia