Weird configuration of the Desargues' theorem. Is it correct?

[Iron-ben]

Desargues' theorem:
Two triangles are in perspective axially if and only if they are in perspective centrally.

I was wondering if this particular configuration was correct:

http://garciacapitan.99on.com/bella/imgs/desarg2.gif

http://garciacapitan.99on.com/bella/imgs/desarg2.gif (copy-paste the link ir it doesn't show you the image or doble click on the attached thumbnail)

I don't know if it is even possible for the center of perspectivity (O) be in-between the two triangles. Also I believe that the perspectivity axis (P,Q,R) isn't horizontal.

My first thought was that the correspondent vertices were wrongly located but then again I found this in a geometry book. So please could you help me? Are the correspondent vertices wrongly located or am I not undertanding? HELP please!

 

[pat_connell]

Yes, the triangles in the diagram are in perspective axially, and the configuration is correct. The center of perspectivity (O) is located in-between the two triangles, and the perspectivity axis (P,Q,R) is not horizontal. The correspondent vertices of the two triangles are correctly located.