z-axis
Lowercase. Hyphenate.
In 3D charts, the z-axis shows depth and generally represents values. On the first mention, refer to the z-axis as the value (z) axis, where both the x-axis and y-axis are category axes. On subsequent mentions, use z-axis.
Don't use italic formatting for the z in z-axis unless the entire word is italic.
See also value axis
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