Hi Bruce,
Many thanks for your answer and for your valuable help. I was just following the the examples from the Free Surfer manual on the page 57 (please see the attachment). I believe my image (the slice I sent you on yesterday) is similar or closed looking with the one on the page 57.
Since I am a beginner and you are an expert I will be very grateful if you can let me know your opinion (I am not sure what I should do about correcting this slice).
Many thanks,
Antonella