// return a cloned List of RateSet with shifted value (for example ShiftedRateSet(1, 0.0005) will shift element #1 adding 0.0005 )
public RateSet ShiftedRateSet(int Index, double Shift)
{
RateSet newRateSet = this.Clone(); // clone the obj
newRateSet.ShiftValue(Index, Shift); // shift 'Index' element of newRateSet up of 'Shift' value
return(newRateSet);
}