failure of delauny triangulation

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I've been using DelaunayWatson( set of two dimensional vertices) quite 
effectively for awhile. However just recently I found a case it's failing 
on. The data is not fundamentally different (at least in any way obvious 
to me)  for this failing case, so I'm wondering what's going on. Attached 
is the list of x y points.  There are no duplicates. The failure message 
doesn't help too much, just 

visad.SetException: Delaunay.finish_triang: error in triangulation!

        at visad.Delaunay.finish_triang(Delaunay.java:592)

        at visad.DelaunayWatson.<init>(DelaunayWatson.java:318)



Any ideas? 
BTW "jiggling" the points is really not an option for me, as for other 
reasons I need them to be their original values. I'd rather remove 
offending points than change any.


Donna L. Gresh, Ph.D.
Optimization and Mathematical Software Group
IBM T.J. Watson Research Center
(914) 945-2472
http://www.research.ibm.com/people/g/donnagresh
gresh@xxxxxxxxxx

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