Re[2]: transparent layer?

On Wed, 16 Oct 2002 17:26:54 -0500 Luis A Escobar <luis lsu edu> wrote:
  I meant pictures to teach the concepts of union, intercepts, etc to
  illustrate those operations. I saw the case you document and that
  is exactly what i was looking for.

Fwiw, these are simple to produce in PostScript.
If you find a way to do it in Dia, please post
a brief description.

Alan Isaac

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