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diff --git a/pkg/utilities/nttools/tmatch/getnorm.x b/pkg/utilities/nttools/tmatch/getnorm.x
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+include	<math.h>
+
+#* HISTORY *
+#* B.Simon	24-Aug-94	original
+#* B.Simon	18-Sep-00	Revised computation of proj and added abnorm
+
+# GETNORM -- Compute the squared norm between two table rows
+
+procedure getnorm (in1, in2, ncol, col1, col2, row1, row2, weight, sphere, 
+		   proj, abnorm, norm)
+
+pointer	in1		# i: first table descriptor
+pointer	in2		# i: second table descriptor
+int	ncol		# i: number of match columns
+pointer	col1[ARB]	# i: match columns in first table
+pointer	col2[ARB]	# i: match columns in second table
+int	row1		# i: row number in first table
+int	row2		# i: row number in second table
+double	weight[ARB]	# i: weights used in computing norm
+bool	sphere		# i: apply spherical correction to first column?
+double	proj		# o: projection of norm on first axis
+double	abnorm		# o: norm, possibly without spherical correction
+double	norm		# o: norm (distance) between rows in two tables
+#--
+int	i
+double	val1, val2, dif
+
+begin
+	# Calculate first component of norm
+
+	call tbegtd (in1, col1[1], row1, val1)
+	call tbegtd (in2, col2[1], row2, val2)
+
+	dif = weight[1] * (val1 - val2)
+	proj = dif * dif
+	abnorm = proj
+
+	# Apply correction for spherical coordinates
+
+	if (sphere) {
+	    if (dif > 180) {
+		dif = dif - 360
+	    } else if (dif < -180) {
+		dif = dif + 360
+	    }
+
+	    call tbegtd (in1, col1[2], row1, val1)
+	    call tbegtd (in2, col2[2], row2, val2)
+
+	    val1 = 0.5 * weight[2] * (val1 + val2)
+	    dif = dif * cos (DEGTORAD(val1))
+	}
+
+	# Compute remaining components
+
+	norm = dif * dif
+	do i = 2, ncol {
+	    call tbegtd (in1, col1[i], row1, val1)
+	    call tbegtd (in2, col2[i], row2, val2)
+
+	    dif = weight[i] * (val1 - val2)
+	    abnorm = abnorm + dif * dif
+	    norm = norm + dif * dif
+	}
+
+end
+