The closest copies of one system that were kept apart, closest first.
The readings on the less refined side of the root taken for the base text, as moved or cleaned up by the other side.
The readings the stemma lets arise more than once, with the versions inserting them.
The stemma in the notation Scored uses, the copies by siglum.
How many admissible stemmata were scored.
By collated reading, the symbol of the edition it stands for, where one does.
The copies grouped by the text they carry, each group one version of the stemma.
From the root down.
A stemma proposed from the copies, with what it rests on: the collation, the presence of every reading in every copy, the cost of the best stemma and of the runners-up, and the margin by which the copies decide each of its groupings.