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Copied image to imgur.com, as it was not being displayed because of broken link. Added link to original image source via Wayback Machine. Added two links/

Let me take the opportunity of this year-old question being kicked to the front page to adorn Günter Rote's answer with an image from the web page (broken link) (edit: but see Wayback Machine and the current page) to which he refers:


            
"Parameterization of intersections of quadrics: theory, algorithms and implementation"

(source: Wayback Machine) (source: current)

Joseph O'Rourke
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