<t>Hi, I must quote at T(0) a call on a spread CMS, MAX ( CMS10Y(T(i)) - CMS2Y(T(i)) -K, 0) where K is the strike and the fixing date is T(i), payment at T(i+1).I use two methods :1// A closed form approximation , generalised Black Scholes, and my inputs are CMS10y(0,T(i)), CMS2y(0,T(i)), the instan...