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-rw-r--r--doc/fullswof-utils.texi25
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diff --git a/doc/fullswof-utils.texi b/doc/fullswof-utils.texi
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+++ b/doc/fullswof-utils.texi
@@ -199,6 +199,31 @@ computation.
@end table
+@node Invoking boundaryProfile.py, Invoking makeBoundary, Runtime Dependencies, Usage
+@comment node-name, next, previous, up
+@section Invoking @command{boundaryProfile.py}
+The @command{boundaryProfile.py} program plots a cross-section through
+the topography at the specified boundary. The command-line syntax is:
+
+@example
+./boundaryProfile.py @option{boundary}
+@end example
+
+where @option{boundary} is one of @code{top}, @code{bottom}, @code{left}
+and @code{right}.
+
+The program reads an input file that contains the local height data. As
+a pre-requisite step the input file must be extracted from the global
+@code{xyz} file. A standard utility such as @command{awk} may be used.
+The input filename must be one of
+@code{(top|bottom|left|right)_boundary.txt}.
+
+Elevation at the specified boundary is plotted against distance. The
+colour of the curve denotes the boundary; the @code{top} boundary is
+blue, the @code{bottom} boundary is green, the @code{left} boundary is
+red and the @code{right} boundary is orange.
+
+
@node Invoking makeBoundary, , Runtime Dependencies, Usage
@comment node-name, next, previous, up
@section Invoking @command{makeBoundary}