4 6 = ← →
1 2 3 ↙↓↘
ex) 623 = →↓↘
※ Not all information is accurate bacause of frame drop.
Let me give you some precautions.
I've taken images of every change of hitbox.
Hitbox can be moved even if hitbox does not change.
For example, in the case of normal Kyo's 623C
It's the 10th frame image, and it's described as the whole 10~15th frame.
But The 15th frame is much higher and slightly forward.
These details are omitted, so be careful.