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Dear All - if memory serves me right, the intersection curve of a cone with a cylinder (like in a powder diffraction camera) is not an ellipse, but a "Schnittfigur zweiter Ordnung", loosly translated as 'intersection curve of second order'. Is there a correct English term for that type of curve? Thx, br ----------------------------------------------------------------- Bernhard Rupp 001 (925) 209-7429 +43 (676) 571-0536 [log in to unmask] [log in to unmask] http://www.ruppweb.org/ ----------------------------------------------------------------- The hard part about playing chicken is to know when to flinch -----------------------------------------------------------------