** A unit is the full set of data for one underlying for one date
**1 IVIndex 30, 60, 90, 120, 150, 180 days (Call, Put and Mean).
Dataset is IV index value - all terms.
Data available - IVIndex 30 d: from May 1999; other terms from Nov. 2000.
**2 Historical Volatility data (HV) 10, 20, 30, 60, 90, 120, 150, 180 days.
Dataset is a Historical (Stock) Volatility Value - all terms.
Data available starting Nov. 1999
**3 Volatility Surface data (implied volatilities of options at fixed maturities: 30, 60, 90, 120, 150, 180, 360 and 720 days).
Dataset is an array of 12 implied volatilities - from -50% OTM till 50%ITM (2 values for ATM - separately for Calls and Puts) - all terms.
Data available starting Nov. 2000
**4 Individual contracts data - including each option price (bid, ask, mean), implied volatility, delta, vega, gamma, theta, rho, volume and open interest.
Dataset - all options contracts on the given underlying.
Data available starting Nov. 2000
