Francois Gleyzon

Hi Daniel, I hope you had a good week-end. I have worked on this during the week-end and finally it works ! I strongly recommand this website who present a way for usinf the function *VMASK :

I did not folly understand how it works, but I applied the same principle in my code and it works for what I need to do. 

I would like to thank you deeply for your help, Daniel and Chandra, wishing you a nice day !