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--- bkg_file [2019/06/21 17:02] – created pac079
+++ bkg_file [2025/09/19 15:18] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== 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.
+<code topas>
+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)
+}
+</code>
+**Example usage**
+<code topas>
+bkg_file("myBackground.xy",@,0.5) 'Background with a refined scale factor
+bkg_file("myFixedBackground.xy")  'Background with a fixed scale factor of 1
+</code>