Result of diffuse-only reconstruction. Top row: posterior mean of the spatial excitation field ${\xi }_{\mathbf{x}}^{\text{spat}}$ (left), the spectral-index excitation field ${\xi }_{\mathbf{x}}^{\text{spec}}$ (center), and the inferred spectral index field α(x) (right) after reconstructing the sky using only the diffuse component. Bottom row: posterior mean of the spectral deviation excitation field ${\xi }_{\mathbf{x},\nu }^{\mathrm{d}\mathrm{e}\mathrm{v}}$ at ν_low (left), at ν_hi (center), and the excitation-norm diagnostic r(x) (right), computed from the displayed excitation fields. Candidate point-source locations identified using the excitation-norm threshold $\overline{r}=0.6$ are highlighted with lime-colored circles in the r(x) panel.