[orthonormal]

Ignoring the numbers on vertical axis, plots look like they are normalized to fit the plotting area. TODO/LoC should basically have the same form.

[kuu]

I don't think so. These plots are normalized by the max number of TODO's, but that may vastly differ from max TODO/LoC of each project.

[cies]

Indeed! When those numbers jump up/down in the graphs, there's prolly a code merge/purge cause to it.