**Table 3:** Best fit parameters for the nonthermal component (I Zw 18 at t=12 Myr).
Model	$l_{\rm nt}\tau_{\rm nt}(5~{\rm ~GHz})$	$\chi ^2$	$\chi _\nu ^2$
	(W Hz^-1 yr)
E	$1.1\times 10^{22}$	8.2	1.6
F	$2.5\times 10^{22}$	7.5	1.5
G	$1.1\times 10^{22}$	8.2	1.6
H	$2.5\times 10^{22}$	7.6	1.5

Source LaTeX | All tables | In the text