2.1.1524 Part 4 Section 5.7.2.116, multiLvlStrRef (Multi Level String Reference)

a.   The standard states that this element specifies  a reference to data for the category axis with a cache of the last values used.

In Office, this element specifies a reference to data for the category axis (or for the x-values in a bubble or scatter chart), along with a cache of the last values used.

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