René J.V. Bertin and Duncan responded to my note. Thank you to both,
that is great information. I'm working through the ideas now but thus
far haven't found a solution. I won't repeat the whole exchange at this
point, waiting until I have something to add.
-- 
         Dave Close, Compata, Irvine CA       +1 714 434 7359
       d...@compata.com              dhcl...@alumni.caltech.edu
"Modesty is a virtue, yet one gets further without it." --Hugo de Vries


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