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  • $\begingroup$ These pictures are beautiful. But I was rather hoping for a 2-Dimensional version of this---with say p on the x-axis and q on the y-axis. Is there any way to project the 3D figure onto 2D? Or draw it originally as 2D? $\endgroup$ Commented Jul 22, 2019 at 17:13
  • $\begingroup$ @kglr any ideas on making your solution 2D? $\endgroup$ Commented Jul 22, 2019 at 18:06
  • $\begingroup$ @ChrisK, found something that works-- could be cleaner. $\endgroup$ Commented Jul 22, 2019 at 19:20
  • $\begingroup$ @kglr Yeah, too bad RegionPlot leaves a big hole in the middle by default. $\endgroup$ Commented Jul 22, 2019 at 19:48
  • $\begingroup$ @kglr may I ask a follow up on the comments here? I'm working with a more complicated version of the question I asked earlier. For various reasons, I ended up using the answer below that uses RegionPlot. I've been struggling getting a big white hole in the middle. I then noticed the comment above on RegionPlot. Why does this hole arise with RegionPlot and why does the MWE below not suffer from that problem? (I must have changed the solution below in a way that inserted the hole.) $\endgroup$ Commented Feb 5, 2020 at 5:49