Francois Gleyzon

Thank you very much for your answers !
I definitively think that this node (18828) might be a mid-side node. Is there a way to tell ? I used a section plane while ploting a result and it seems that the point was in the middle of a segment. 

And also, I applied this command "nsle,s,corner" at the begining of the post processing section of the script. Does it know force all the points found and computed to be corner´s node. I am not sure to really have understood what is the purpose of this command.