2.1.1481 Part 1 Section 21.2.2.83, hPercent (Height Percent)
a. The standard does not define the behavior when the hPercent element is omitted.
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If this element is omitted, Office uses automatic scaling. If automatic scaling is enabled, the height of the 3-D chart expressed as a percentage of the chart width shall be the ratio of plot area height to plot area width.
b. The standard does not specify how to interpret the hPercent element on a pie3Dchart.
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In Office, this element on a pie3DChart specifies that the thickness of the 3-D pie chart shall be the default thickness (defined by the SpreadsheetML application) multiplied by the height percent.
c. The standard states that the hPercent element specifies the height of a 3-D chart as a percentage of the chart width.
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In Office, this element specifies the height of a 3-D chart as a percentage of the 3-D plot area width, and disables automatic scaling for the chart height.