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Figure 1: Time evolution of basic quantities concerning radio emission, with the solid and dashed lines corresponding to the continuous and burst SFR, respectively. The initial conditions are selected to be the "active'' mode, consistent with the observations of SBS 0335-052 at  Myr. a) Radius of ionized region as a function of time. b) Number density of protons in the ionized region . c) Emission measure. d) Star formation rate. The dotted lines show the analytical approximation: , , and .

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In the text

Figure 2: Radio SEDs at t=5 Myr calculated by a) model A, b) model B, c) model E, d) model F, e) model G, and f) model H for the same initial condition as Fig. 1. For model E, we adopt the best fit parameter of . The dotted and dashed lines represent the thermal and nonthermal components, respectively, and the solid line shows the sum of those two components. The points are observational data taken from Hunt et al. (2004) (squares) and Dale et al. (2001) (cross). The reduced value ( ) is also shown in each panel.

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In the text

	Figure 3: Same as Fig. 1 but for the I Zw 18 "passive'' model.
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In the text

Figure 4: Radio SED at t=12 Myr calculated for I Zw 18 by using models E, F, G, and H (panels a), b), c), and d), respectively). The dotted and dashed lines represent the thermal and nonthermal components, respectively, and the solid line shows the sum of those two components. The squares are observational data taken from Hunt et al. (2005) and references therein. The reduced value ( ) is also shown in each panel.

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In the text

	Figure 5: Same as Fig. 4 but for t=15 Myr.
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In the text

	Figure 6: Time evolution of an "active'' radio SED. The same parameters as used to model SBS 0335-052 are adopted as a representative case for the "active'' mode. Panels a), b), c), and d) represent the SEDs at 3.5, 5, 10, and 15 Myr, respectively. The dotted and dashed lines represent the thermal and nonthermal components, respectively, and the solid line shows the sum of those two components.
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In the text

	Figure 7: Same as Fig. 6 but for the "passive'' mode, with the I Zw 18 model as a representative case.
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In the text

	Figure 8: Time evolution of the radio spectral index defined at 1.5 GHz and 5 GHz [ ]. The solid and dotted lines show the results of the "active'' and "passive'' models (same as Figs. 6 and 7, respectively).
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In the text