Syntax:
set view projection {xy|xz|yz}
Rotates the view angles of a 3D plot so that one of the primary planes
xy, xz, or yz lies in the plane of the plot. Axis labels and tics positioning
is adjusted accordingly; tics and labels on the third axis are disabled.
The plot is scaled up to approximately match the size that 'plot' would
generate for the same axis ranges.
set view projection xy is equivalent to set view map.