Extracting fit parameters from simultaneous fit

Hi,
I am doing a simultaneous fit to an invariant mass line shape as a function of mass of a pseudoscalar higgs (M_a). The fit is a Gaussian plus Landau and the mean and width of each are extracted from a linear fit. Is there a way to get roofit to spit back the parameters for a given M_a? What I do now is

   frSim = wks->pdf("pdfSim")->fitTo(*dataSimT,RooFit::Save());

then

   frSim->Print("v");

which gives me the slope and intercept for the linear fits. But when I use those to reconstruct the Gaussian+Landau at a given M_a, it comes out a bit different from what Roofit plots with

    wks->pdf("pdf"+signal)->plotOn(v_plotS[i],RooFit::VisualizeError(*frSim,1),RooFit::FillColor(kOrange-1),RooFit::FillStyle(3244));

Any suggestions are much appreciated.

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