height=\figureheight,
scale only axis,
xmin=0, xmax=150,
-xlabel={R},
+xlabel={$R$},
xmajorgrids,
+xtick={0, 50, 100, 150},
ymin=0, ymax=20,
ylabel={GPUs},
ymajorgrids,
-zmin=0.2, zmax=1,
+zmin=0.0, zmax=1,
zlabel={Efficiency},
zmajorgrids,
axis lines*=left]