This function fits the Qxt using method 2 (two parameters relational method, see reference).
Usage
Method2(MyData, AgeRange, Plot = F, Color = MyData$Param$Color)
Arguments
MyData
The list returned by the AddReference() function.
AgeRange
Age range used for the calculation of the parameters.
Plot
If set to TRUE, a sub-directory will be created in the working directory. This sub-directory will contains png plots corresponding to the smoothed surface.
Color
The color that will be used for the plots (HTML notation).
providing 
.