You need to zoom into image to see details that ive added.!!!
There technically is no tier for "size 0", size zero is positive scale with tier 1 (max height). There are three tiers to scale, negative, standard, and positive.
The existing lines I believe are for the smallest scale, the line in the center of each long line I've added a (-) This is for standard scale, last the (.) Ive added Indicates tallest scale (for said color group).
There are 13 obtainable tiers of height, the reason size 0 seems missing is because the existing minaki chart shows smallest profile. Size 0 is not a tier of height on its own.
I very well could be wrong but this idea seems to match up really well with everything I've found out/tested/looked up.
I didn't do the entire chart because I think you can understand the point, I filled in indicators on the top half of sizes.