Scribes and authorship of the text

[magnesium]

The puzzling bit is why there is a slight increase from the first graph point to the second, while the following ones decrease just as expected.  

It could be an artifact of how word spaces are identified by transcribers, and how the dubious space (",") are treated in the analysis.  When the first glyph of the line is y or o, it is often followed by a slightly wider space that some transcribers mark with period, comma, or nothing, often based on subjective criteria that seem to be different from those used when a word-initial o or y appears in the middle of a line.  Could this inconsistency be the cause of that anomaly near the left edge?

I haven't looked at this in detail, so I'm not sure. I also wonder whether there is a kind of "relaxation" in spacing from the end of one line to the start of the next. In principle, a scribe wrote the beginning of one line very shortly after finishing the previous line, so over the first couple of words in the new line, the scribe is adjusting to having much more room to write than they just did. Then the scribe settles into a spacing groove, only to start to narrow their spacing—and increase their cramming—once they're about halfway done with a line.