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diff --git a/lib/math/nlfit.h b/lib/math/nlfit.h
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+# Definitions for the non-linear least-squares fitting package NLFIT
+
+# define parameters for nlstat[ird]
+
+define	NLNPARAMS	1
+define	NLNFPARAMS	2
+define	NLITMAX		3
+define	NLITER		4
+define	NLSUMSQ		5
+define	NLOLDSQ		6
+define	NLLAMBDA	7
+define	NLTOL		8
+define	NLNPTS		9
+define	NLSCATTER	10
+
+# define the weighting flags
+
+define	WTS_USER	1	# User enters weights
+define	WTS_UNIFORM	2	# Equal weights
+define	WTS_CHISQ 	3	# Chi-squared weights (input data in photons)
+define	WTS_SCATTER	4	# Weights include an adjustable scatter term
+
+# define the error conditions
+
+define	DONE			0	# Solution converged
+define	SINGULAR		1	# Singular matrix
+define	NO_DEG_FREEDOM		2	# Too few points
+define	NOT_DONE		3	# Solution did not converge