## 1.8.4 Specifying the positioning of axes

By default, the `x1`-axis is placed along the bottom of graphs and the `y1`-axis is placed up the left-hand side of graphs. On three-dimensional plots, the `z1`-axis is placed at the front of the graph. The second set of axes are placed opposite the first: the `x2`-, `y2`- and `z2`-axes are placed respectively along the top, right and back sides of graphs. Higher-numbered axes are placed alongside the `x1`-, `y1`- and `z1`-axes.

However, the position of any axis can be explicitly set using syntax of the form:

    set axis x top
    set axis y right
    set axis z back

Horizontal axes can be set to appear either at the `top` or `bottom`; vertical axes can be set to appear either at the `left` or `right`; and -axes can be set to appear either at the `front` or `back`.