Hello Javier,
what exactly are you trying to achieve? For what I see you have named your image “eyes closed”, so I’m gonna assume it’s something related to that action(open, close, relaxed).
I’m not proficient in matlab, but I’m in another cool languages (to plot those graphics), so if that’s not a problem, feel free to contact me, at hugop02AThotmail.com.
BR,
Hugo.