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  • $\begingroup$ Your code produces a different outcome than the plot you posted: imgur.com/a/tk9bP. Also, the PlotLegends -> .... is irrelevant for the question asked. Finally, I'm quite surprised that MeshFunctions -> ConditionalExpression[{#1 + #2 &, #1 &}, -15 + #1 + #2 >= 0 &] (and its variations) doesn't work. $\endgroup$ Commented Sep 3, 2017 at 19:13
  • $\begingroup$ That's odd... even after clearing my globals, I still get a different plot than you. i.imgur.com/NOuHBEs.png As you see I'm using MM11.1 (on Windows 10). Were you under the impression that ConditionalExpression should have worked here? $\endgroup$ Commented Sep 4, 2017 at 9:31