Here's what I see:
Today: 30-day historical vol of HSI: 13.2%, HHI 20.3%
31st Jul '13: HSI 30-day HV 19.3%, HHI 26.3%
I.V. ATM Jan options exp, HSI: 13.6%, HHI: 22.8%
HSI full contract value: ~ US$147,935
HHI full contract value: ~ US$66,251
Ratio of contract values HSI/HHI...