2.1.1479 Part 4 Section, errDir (Error Bar Direction)

a.   The standard does not define the behavior when the errDir element is omitted.

In Office, if this element is not defined the default behavior is x for horizontal bar charts. For all other chart types, the default behavior is y.

b.   The standard states errDir can be a child of any errBars element.

Office loads and respects this element on any errBars parent element; however, this element is only saved back out on line or scatter series.