Dear Massimo
Please be alert on what we are talking about.  I talked about three kinds of 
prate calculation, 80/180, 100/160 and 80/160.  Among the three, I said the first two are realistic for the producers A and B respectively.  But the third is not real and yet is more economically relevant.  Please make sure first why I talked about
the three distinct prates, and why I said the last one is not real.  I say the last one is the most relevant, however.  
Yours,
Chai-on