Add Fwd Spread

Function Add Fwd Spread within
Yield Curve with keys Yield Curve Add Fwd Spread keys builds and returns a new spreaded yield curve implied by the source yield curve.
It is an alternative - and easier - method of adding a spread to the instantaneous forward rates of a given curve as compared with the standard method of using the
Create function with input in Market Data an object of type ImpYC Fwd Spreaded
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