XAFS provides input options for data in HASYLAB, feff, and general column oriented formats.

XAFS features seven line shape functions for XANES fit: arctangian, error function, and linear linear combinations therof, Fano (step functions), Lorentzian, Gaussian, and pseudo-Voigt (peak functions).

EXAFS fit options are standard (with fit parameters N, R, s^2 and E0), general (N, R, s^2, E0, c3, c4, and h, x, n, parameters for electron mean free path, analytical distribution (N, R, s^2 , E0, and asymmetry parameter h) numerical distribution (s^2 , E0, 25 bins), and cumulant expansion (up to c4). Distribution reconstruction is performed by inverse sine fourier transform of chi data. The maximum number of shells / path fitted is seven.

Multiple scattering is available through the interface to feff. The analytical distribution fits use weighted exponential functions (m=0,1,and 2).

Currently, xafs runs on 68000 series Apple Macintosh computers with math coprocessors (fpu) and will soon be available in Power Macintosh and unix versions.