On the flat drawing, two axes, " x " and " z " on the figure, are perpendicular and the length on these axes are drawn with a 1 : 1 scale; it is thus similar to the dimetric projections, although it is not an axonometric projection, as the third axis, here " y ", is drawn in diagonal, making an arbitrary angle with the " x3 " axis, usually 30 or 45?
