<t>Thank you very much g000RRRr.Actually,we havent tried to calibrate Heston model to a single expiration yet but what we did is exactly what you suggest.We used 6 options(3 ITM,1 ATM,3 OTM) for each 1 month,2 m ,3 m ,6 m,9m ,and 1 year expirations in total 42 options data on 16 January 2008.When w...