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I expected the following to render two lines: ( y=1 , z=3 ) and ( y=2 , z=5 )
\begin{tikzpicture}
\begin{axis}[
3d box=complete,
grid=major,
xlabel=$x$,
ylabel=$y$,
zlabel=$z$,
samples=5
]
\addplot3[color=red,domain=0:200,y domain=1:1,samples=201,samples y=1,variable y=\y] {3};
\addplot3 ...