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Vol_Curve__Vol_Input__Swaption_Surface

The volatility depends on Key Vol::Peg Date, but also on the tenor of the underlying swap assumed to start on Peg Date.
It is specified by a
Table2D object containing volatilities for various (option expiry,swap tenor) combinations.
The first dimension must span the option expiries (entered as dates or steps) and the second the swap tenors (entered as steps).
Note this type only makes sense if the entry
Key Vol Spec::Ref Quotable defined within Vol Spec relates to a Vanilla Swaption.
It is implemented through the QuantLib SwaptionVolatilityMatrix.
Linear interpolation is assumed for those dates and tenors that do not appear in the Table2D
A separately supplied user-defined entry determines whether flat or linear extrapolation is applied.