2.1.1433 Part 1 Section 21.2.2.10, axPos (Axis Position)

a.   The standard states that the axpos element specifies the position of the axis on the chart.

Office ignores this element, always using the crosses element on a valAx, the crossesAt element on a catAx or dateAx, and the orientation element of the scaling element on the perpendicular axis to specify the axis position.