The command set view equal xy forces the unit length of the x and y axes
to be on the same scale, and chooses that scale so that the plot will fit on
the page. The command set view equal xyz additionally sets the z axis
scale to match the x and y axes; however there is no guarantee that the
current z axis range will fit within the plot boundary.
By default all three axes are scaled independently to fill the available area.
See also set xyplane (p. ).