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    <img src="./doc/images/simple_trimmed.png" width="619" height="325" alt="simple topography"/>
 </p>
 
+<p align="center">
+   Surface plot of a simple topography.  The data points form a structured grid.
+</p>
+
 ## Description
 
 The _FullSWOF-utils_ package provides pre-processing utility programs