How is it possible that the VIX opened above 14 on the expiry day and was above 13.70 for hours but the SOQ was 13.63 ? (As I understood from the Assignment (VIX MAY07 14 P) -370.00 ) I understand that it is calculated in a different way but SO DIFFERENT ?! Moreover, having options in the money on VIX at expiry I was looking for a place to have SOQ quotes. Any suggestion?