[Reference] → [System 2 Graphic Specification]
A: Battle cursor (16 x 16 pixels)
B (1~3): Gauge frames displayed in battle, 3 types (each 48 x 16 pixels)
C: (1~6): Gauges displayed in battle, 6 types (each 16 x 16 pixels)
D: Status numbers displayed in battle (each 8 x 16 pixels)