**Table 1:** Description of VLBA maps of 3C 66A shown in Fig. 1.
			Restoring Beam
$\nu$	Epoch	$S_{\rm peak}$	Major	Minor	PA	Contours
(GHz)	(yr)	(Jy/beam)	(mas)	(mas)	(deg)	(mJy/beam)
(1)	(2)	(3)	(4)	(5)	(6)	(7)
2.3 GHz	2001.20	0.678	5.78	3.67	-1.21	1.70 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2001.48	0.641	5.96	3.68	-1.24	1.88 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2001.86	0.748	5.39	3.87	-5.16	1.70 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2002.11	0.718	5.4	3.9	-7.06	1.42 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2002.14	0.598	5.47	3.87	-7.1	1.79 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2002.45	0.584	5.33	3.98	-3.55	1.72 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
8.4 GHz	2001.20	0.653	1.6	1.04	-0.34	1.74 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2001.48	0.719	1.61	1.01	-2.06	2.34 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2001.86	0.696	1.44	1.08	-4.23	2.18 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2002.11	0.623	1.46	1.09	-7.81	2.27 $\times$ (-1, 1, 2,4, 8, 16, 32, 64, 128, 256)
	2002.14	0.586	1.43	1.07	-6.05	2.28 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2002.45	0.494	1.42	1.06	-4.22	2.63 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128)
22.2 GHz	2001.20	0.718	0.64	0.41	0.57	2.73 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128, 256)
	2001.48	0.638	0.71	0.38	-0.80	3.50 $\times$ (-1, 1, 2, 4, 8, 16, 32, 64, 128)

Notes: (1) Observing frequency; (2) observing epoch; (3) peak flux density; (4), (5), (6) parameters of the restoring Gaussian beam: the full width at half maximum (FWHM) of the major and minor axes and the position angle (PA) of the major axis. (7) Contour levels of the map. The lowest contour level is three times the rms noise in the maps.

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