Summary of the photometric diagrams introduced in Section 3.1. Panel (a1) and (a2): two-color diagram of m_F275W-m_F336W vs. m_F336W-m_F438W and C_U,B,I vs. B − I pseudo two-color diagram for the red HB of NGC 5927. Panel (b): Δ_CU,B,I vs. Δ_U,B ChM of NGC 5286. Panel (c): same but for NGC 6656. Panel (d): Δ_{CF275W,F336W,F435W} vs. Δ_F275W,F814W ChM of ωCen derived from the catalog by Häberle et al. (2024). Green, violet, and red dots represent 1P, 2P, and anomalous stars, respectively.