2.1.1475 Part 1 Section 21.2.2.75, gapWidth (Gap Width)

a.   The standard does not state how to interpret a gapWidth element on an ofPieChart element.

In Office, the gapWidth element on an ofPieChart element specifies the radius of the primary pie for an ofPieChart.

b.   The standard states that the gapWidth element specifies the space between bar or column clusters, as a percentage of the bar or column width.

In Office, this element specifies the space between adjacent series clusters in the category axis direction, as a percentage of the bar or column width for bar3DChart, barChart, and upDownBars.