All Figures

	Figure 1: Combined VLA map of 11 epochs (A, B, C and D-array) of III Zw 2 at 1.4 GHz ( top) and at 4.8 GHz ( bottom). All maps were convolved with a beam of  arcsec to detect faint extended emission. The contours start at 0.26 mJy at 1.4 GHz and 0.15 mJy at 4.8 GHz, and increase with a factor of .
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In the text

	Figure 2: Combined VLA map of 11 epochs (A, B, C and D-array) of III Zw 2 at 8.4 GHz ( top) and 15 GHz ( bottom). All maps were convolved with a beam of  arcsec to detect faint extended emission. The contours start at 0.12 mJy at 8.4 GHz and 0.6 mJy at 15 GHz, and increase with a factor of .
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In the text

	Figure 3: Spectra of the southwestern (circles) and northeastern (squares) radio lobes. The black triangles are upper limits for the northeastern lobe.
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In the text

	Figure 4: Radio light curves of III Zw 2. The triangles at 8 and 15 GHz are from the Michigan monitoring program, the squares at 22 and 37 GHz are from the Metsähovi monitoring program. The circles are our VLA observations at 8, 15, 22, and 43 GHz.
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In the text

	Figure 5: Radio light curves of the recent flare in III Zw 2 at 1.4, 4.8 and 8.4 GHz. Circles are our VLA observations, and triangles are from the Michigan monitoring program. Solid lines are our linear rise and decline fits, while dashed lines are the fitted exponential rise and decay.
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In the text

	Figure 6: Radio light curves of the recent flare in III Zw 2 at 15, 22 and 37/43 GHz. Circles are our VLA observations, and triangles are from the Michigan monitoring program, and squares are from the Metsähovi monitoring program. Solid lines are our linear rise and decline fits, while dashed lines are the fitted exponential rise and decay.
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In the text

	Figure 7: Time-lag between the peak at 43 GHz and the peak at the other frequencies. The data point at 1.4 GHz is a lower limit.
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In the text

	Figure 8: Rise () and decay (+) timescales for all frequencies.
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In the text

	Figure 9: Spectra of III Zw 2 on 4 November 1998 ( top), 22 February 1999 ( middle), 12 November 1999 ( middle), and 30 January 2001 ( bottom) together with the quiescent spectrum (horizontal line) and the best fit spectrum.
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In the text

Figure 10: Evolution of the "turnover frequency'' . Circles mark epochs with 6 observed frequencies (1.4-43 GHz) and triangles epochs with 5 observed frequencies (1.4-22 GHz). In the last two epochs only 4 frequencies (1.4-15 GHz) were used because of a new outburst at high frequencies. The cross is the turnover frequency of the spectrum in May 1998, where the 1-43 GHz data is taken from Falcke et al. (1999). The asterisks mark the epochs of our VLBA observations.

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In the text

	Figure 11: Evolution of the spectral indices k (circles) and l (squares). The asterisks mark the epochs of our VLBA observations.
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In the text

	Figure 12: All six VLBA maps of III Zw 2 at 43 GHz convolved with a superresolved circular beam of 150 as.
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In the text

	Figure 13: Component separation at 43 ( upper) and 15 ( lower) GHz. The apparent expansion speed is 0.6 c at 15 GHz and 1.25 c at 43 GHz.
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In the text

	Figure 14: Intrinsic turnover frequency vs. linear size for GPS and CSS sources. The quasars are represented by crosses, and the galaxies by solid squares. Adapted from O'Dea & Baum (1997). The two circles mark values for III Zw 2 before and after the expansion at 43 GHz.
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In the text