We show explicitly how the lag–energy spectrum depends on the exact frequency band. Here, we use narrower frequency bands. The blue solid–dotted curves represent the narrow low-frequency bands of Δf₁ = (0.8−1.6) × 10⁻⁴ Hz = (0.34–0.67) × 10⁻³ M₆ c/R_g and Δf₂ = (1.6−3.2) ×10⁻⁴ Hz = (0.67–1.34) × 10⁻³ M₆ c/R_g, where M₆ = M_BH/10⁶ M_⊙. The red solid–dotted curves are for the narrow high-frequency bands Δf₃ = (2−6) ×10⁻⁴ Hz = (0.84–2.52) × 10⁻³ M₆ c/R_g and Δf₄ = (6−10) × 10⁻⁴Hz = (2.52–4.20) × 10⁻³ M₆ c/R_g. The three columns (left to right) represent different disk configurations: (a) the SE disk, (b) a low-inclination thin disk, and (c) a high-inclination thin disk. Each row has a different M_BH = (1, 5, 20) × 10⁶ M_⊙. The most notable distinction between the two disk geometries is that the lag–energy spectrum of the SE disk remains almost the same despite the change in the frequency band until M_BH becomes sufficiently large.