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.
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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.