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+# BACKGROUND -- Subtract line or column background
+
+input,s,a,,,,Input images to be background subtracted
+output,s,a,,,,Output background subtracted images
+axis,i,h,1,1,2,Axis along which background is fit and subtracted
+interactive,b,h,yes,,,Set fitting parameters interactively?
+sample,s,h,"*",,,Sample of points to use in fit
+naverage,i,h,1,,,Number of points in sample averaging
+function,s,h,"chebyshev","spline3|legendre|chebyshev|spline1",,Fitting function
+order,i,h,1,1,,Order of fitting function
+low_reject,r,h,0.,0.,,Low rejection in sigma of fit
+high_reject,r,h,0.,0.,,High rejection in sigma of fit
+niterate,i,h,1,0,,Number of rejection iterations
+grow,r,h,0.,0.,,Rejection growing radius
+graphics,s,h,"stdgraph",,,Graphics output device
+cursor,*gcur,h,"",,,Graphics cursor input