Metadata for a labelled plot. x-axis is always a string/label, so no x-axis units are required. y-axis is numeric, and so units are optional here.
Optional
In depth description of what exactly is represented and how it has been calculated
Summary of what the plot or statistic is trying to achieve
Title of plot or statistics
Metadata for a labelled plot. x-axis is always a string/label, so no x-axis units are required. y-axis is numeric, and so units are optional here.