Index: fipy/viewers/gnuplotViewer/gnuplot1DViewer.py
===================================================================
--- fipy/viewers/gnuplotViewer/gnuplot1DViewer.py	(revision 3652)
+++ fipy/viewers/gnuplotViewer/gnuplot1DViewer.py	(working copy)
@@ -77,11 +77,20 @@
         for var in self.vars:
             # Python 2.6 made 'with' a keyward (deprecation warnings have been issued since 2.5)
             # this was addressed in Gnuplot.py in r299, in 2007
-            tupleOfGnuplotData += (Gnuplot.Data(numerix.array(var.getMesh().getCellCenters()[0]), 
-                                                numerix.array(var.getValue()),
-                                                title=var.getName(),
+            yvals = numerix.array(var.getValue())
+            title = var.getName()
+            try:
+                tupleOfGnuplotData += (Gnuplot.Data(numerix.array(var.getMesh().getCellCenters()[0]), 
+                                                yvals,
+                                                title=title,
                                                 with_='lines'),)
-                              
+            except ValueError:
+                #assume this error is because we plot a facevariable:
+                tupleOfGnuplotData += (Gnuplot.Data(numerix.array(var.getMesh().getFaceCenters()[0]), 
+                                                yvals,
+                                                title=title,
+                                                with_='lines'),)
+
         apply(self.g.plot, tupleOfGnuplotData)
     
 if __name__ == "__main__":