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diff --git a/pkg/utilities/nttools/trebin/tugcol.x b/pkg/utilities/nttools/trebin/tugcol.x
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+++ b/pkg/utilities/nttools/trebin/tugcol.x
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+include <error.h>
+include <tbset.h>
+
+# tugcol -- get input X values
+# Get input independent variable column and check it to make
+# sure it is either monotonically increasing or decreasing.
+#
+# Phil Hodge, 18-Apr-1988  Subroutine created
+# Phil Hodge, 30-Jan-1992  Check independent variables more carefully.
+# Phil Hodge, 27-Apr-2000  Move most of this routine to tudcol;
+#			rewrite to allow either array or scalar column.
+
+procedure tugcol (itp, iv_icp, row, xin, xnelem, padvalue, array)
+
+pointer itp			# i: pointer to input table descriptor
+pointer iv_icp			# i: ptr to descr for input indep var column
+int	row			# i: row number, if input column contains arrays
+double	xin[ARB]		# o: input independent variable values
+int	xnelem			# o: actual number of elements in xin array
+double	padvalue		# i: ignore this value at end of xin array
+bool	array			# i: true if input column contains arrays
+#--
+pointer sp
+pointer temp			# scratch for checking indep var for duplicates
+int	nelem			# array size
+int	nvals			# number of elements actually gotten
+int	nrows			# number of rows in input table
+int	i			# loop index
+int	op			# index in temp
+int	tbcigi(), tbpsta(), tbagtd()
+string	NOT_MONOTONIC	"input independent variable is not monotonic"
+
+begin
+	if (array) {
+
+	    nelem = tbcigi (iv_icp, TBL_COL_LENDATA)
+	    nvals = tbagtd (itp, iv_icp, row, xin, 1, nelem)
+	    if (nvals != nelem) {
+		call eprintf (
+	"Not all input independent variable data were gotten from row %d\n")
+		    call pargi (row)
+		call error (1, "")
+	    }
+	    xnelem = nvals
+
+	} else {
+
+	    nrows = tbpsta (itp, TBL_NROWS)
+	    do i = 1, nrows
+		call tbegtd (itp, iv_icp, i, xin[i])
+	    xnelem = nrows
+	}
+
+	# Trim trailing INDEF and pad values by reducing xnelem.
+	call tu_trim (xin, xnelem, padvalue)
+
+	call smark (sp)
+	call salloc (temp, xnelem, TY_DOUBLE)
+
+	# Copy the independent variable data to scratch, skipping embedded
+	# INDEF values.
+	op = 0
+	do i = 1, xnelem {
+	    if (!IS_INDEFD(xin[i])) {
+		Memd[temp+op] = xin[i]	# op is zero indexed at this point
+		op = op + 1
+	    }
+	}
+
+	if (op > 1) {
+	    # Check the independent variable values to make sure they're
+	    # monotonically increasing or decreasing.
+	    if (Memd[temp+1] > Memd[temp]) {		# increasing
+		do i = 2, op {				# one indexed
+		    if (Memd[temp+i-1] <= Memd[temp+i-2])
+			call error (1, NOT_MONOTONIC)
+		}
+	    } else {					# decreasing
+		do i = 2, op {
+		    if (Memd[temp+i-1] >= Memd[temp+i-2])
+			call error (1, NOT_MONOTONIC)
+		}
+	    }
+	}
+
+	call sfree (sp)
+end