2.1.1581 Part 4 Section 18.104.22.168, showDLblsOverMax (Show Data Labels over Maximum)
a. The standard states that the default value of the val attribute is true.
Office uses a default value of false for this attribute.
This note applies to the following products: 2007, 2007 SP1, 2007 SP2.
b. The standard states that this element specifies that data labels over the maximum of the chart shall be shown.
In Office, this element specifies that data labels with data whose value is over the axis maximum or under the axis minimum shall be shown.