NAME: barrel_sp_fitgrid2.pro DESCRIPTION: BARREL low-level spectral folding routine, method 2 (single model file, single drm) REQUIRED INPUTS: subspec background subtracted count spectrum, cts/keV subspecerr its error bars model spectral model of electron spectrum (default is exponential) 1 = exponential 2 = monoenergetic 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 startpar Starting value of spectral parameter startnorm Starting value of spectral normalization 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: bestpar best-fit value of the spectral parameter bestnorm best-fit value of the normalization parameter bestparn array location of bestpar bestnormn array location of bestnorm modvals values of the best-fit function at the data bin centers chiarray array of chi-square values bestchi lowest chi-square value pararray array of spectral parameter values normarray array of normalization parameter values CALLS: None. STATUS: Passed early test on artificial data TO BE ADDED: N/A REVISION HISTORY: Version 1.0 DMS 7/24/12 derived from barrel_fitgrid1 11/12/13 insist on only one value of bestparn, etc.