As I sit here waiting for the Fed, here are some numbers:
TYZ0 (10 US Treasury future)
TYX0C 125 (125 strike call option on said future)
9/20: TYZ0 = 124.40625, TYX0C = 0.81, IV = 7.357%
9/21: TYZ0 = 125.375, TYX0C = 1.19, IV = 6.794%
On 9/20:
Delta was worth about 0.42 options...