Hello all, Is there a limit on the total length of arguments that follow an Ifeffit command? If so, is there a way of expanding the limit? I've constructed a rather complicated model which uses 37 paths (mostly multiple scattering). Furthermore, quite a few of these paths are sensitive to scattering angle, so I have calculated FEFF files for three versions each of most paths (each for a different scattering angle), as suggested in the course "EXAFS Analysis with FEFF and FEFFIT" and the old Feffit manual. Thus the final Ifeffit command calls on a lot of FEFF paths, each specifically numbered according to path and angle. Unfortunately, after adding a few extra paths I get error messages when running the feffit command: "feffit:unknown key" followed by a list of paths about halfway through my list, and also "feffit: no chi(k) data array?". I assume that this is because ifeffit will only swallow half the command, which is: feffit(1-4,500,510,520,600,610,620,700,710,720,800,810,820, 9-13,15-16,1700,1710,1720,1800,1810,1820,1900,1910,1920,2000,2010,2020, 37, 3800,3810,3820,3900,3910,3920,4000,4010,4020,4100,4110,4120, 4200,4210,4220,4300,4310,4320,4400,4410,4420,4500,4510,4520, 4600,4610,4620,4700,4710,4720,4800,4810,4820,4900,4910,4920, 5000,5010,5020,5100,5110,5120,5200,5210,5220,5300,5310,5320, 5400,5410,5420,5500,5510,5520, chi = data15.chi, macro = plot_fit) Short of actually renumbering all my paths so that they run sequentially, is there any solution...? Have a merry Christmas, Peter Peter Southon Research Fellow - School of Chemistry University of Sydney, NSW 2006, Australia +61 2 9351 4425