NAME: barrel_sp_fitgrid3.pro DESCRIPTION: BARREL low-level spectral folding routine, method 3 ( two file-based spectral shapes, single drm) REQUIRED INPUTS: subspec background subtracted count spectrum, cts/keV subspecerr its error bars modelspec1 first spectral component (at all energies) modelspec2 second spectral component drm response matrix for correct payload altitude and chosen PID of electrons phmean energy bin centers for the photons dimension phwidth energy bin widths for the photons dimension usebins which energy channels to use in minimizing chisquare startnorm1 Starting value of normalization of 1st component startnorm2 Starting value of normalization of 2nd component points Number of points on each side of starting values to test scaling Range around the starting values to test -- for example, points=2 and scaling=1.5 means that the values tested are x/1.5, x/1.25, x, x*1.25, x*1.5 OPTIONAL INPUTS: none OUTPUTS: bestnorm1 best-fit value of the first normalization bestnorm2 best-fit value of the second normalization bestnorm1n array location of bestnorm1 bestnorm2n array location of bestnorm2 modvals1 values of the fit function at the centers of the energy bins (first component) modvals2 values of the fit function at the centers of the energy bins (second component) chiarray array of chi-square values bestchi lowest chi-square value norm1array array of first normalization parameter values norm2array array of second normalization parameter values CALLS: None. STATUS: Passed early test on artificial data TO BE ADDED: N/A REVISION HISTORY: First version with release 2.3, 8/26/12 11/12/13 insist on only one value of bestparn, etc.