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====== bkg_file ====== Macro which takes a filename and uses it as a background function. A scale factor for the background can be refined. This is particularly useful where there is a strong, feature-containing background which is hard to fit with the Chebyshev polynomial. Including a measured background can also be important for quantitative phase analysis. macro bkg_file(filename,c,v) { #m_argu c If_Prm_Eqn_Rpt(c, v, min 0 max 10000) user_y #m_unique bkg_obj filename fit_obj = CeV(c, v) bkg_obj; } macro bkg_file(filename) { bkg_file(filename, ,1) } **Example usage** bkg_file("myBackground.xy",@,0.5) 'Background with a refined scale factor bkg_file("myFixedBackground.xy") 'Background with a fixed scale factor of 1