0 Notation for base text, UBS 4th
1 A reading that represents the base text with only minor differences (orthography, Nomina Sacra, etc)
2-20 A significant change from the base text with at least two supporting witnesses
50-59 A significant change from the base text but with only one supporting Greek witness or a reading with only Latin support
99 Lacunae listed under significant variation units; omitted portions of the text; and instances where Latin witness are indeterminable (for example, the addition or omission of a Greek article)