Table 1.

The fitting parameters of the null hypothesis ($M_1$ model) and the best-fit two-component model ($M_2$ model).

Model	$m_a$ (μeV)	$S_0$ (mJy)	$\alpha$	$g_{a\gamma \gamma }$ (GeV${}^{-1}$)	${\chi }^2$
$M_1$		82	1.48		50.9
$M_2$	14–17	60	1.13	$2.4\times {10}^{-11}$	16.4
	17–20	82	1.48	0	50.9
	20–23	82	1.48	0	50.9
	23–26	82	1.48	0	50.9
	26–29	85	1.54	$6.3\times {10}^{-12}$	48.7
	29–32	90	1.65	$8.9\times {10}^{-12}$	28.8

Here, the value of $g_{a\gamma \gamma }$ is the best-fit value for each $m_a$ sub-band.