Table 1: Basic information on the VLBA observations: Col. 1: source name (B1950); Col. 2: Observed frequency; Col. 3: Date of observations; Col. 4: missing antenna; Cols. 5 and 6: shortest and longest projected baselines; Cols. 7-9: beam major and minor axis and PA of the full resolution images; Col. 10: 1 $\sigma$ rms noise level on the full resolution image plane.
Source $\nu$ Obs. date Missing $u_{\rm min}$ $u_{\rm max}$ Beam Noise

B1950 GHz antennas M $\lambda$ M $\lambda$ mas mas $\circ$ mJy/beam

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)

B0147+400 1.407 09/06/2004 0.16 41 9.3 5.3 -3 0.21

1.643 0.18 50 8.3 4.7 -4 0.38

4.543 0.49 110 2.9 1.7 -7 0.11

4.893 0.50 140 2.7 1.6 -5 0.10

8.115 0.99 230 1.7 1.0 5 0.08

8.493 1.05 250 1.6 0.9 5 0.07

B0840+424 1.407 11/24/2004 HN 0.15 40 12.0 7.5 -2 0.19

1.643 HN 0.18 46 10.5 6.9 0 0.17

4.543 SC 0.48 110 3.5 1.9 -20 0.15

4.893 SC 0.50 125 3.4 1.8 -20 0.14

8.115 SC 0.83 210 2.0 1.6 -23 0.16

8.493 SC 0.88 230 2.0 1.5 -18 0.12

**Table 1:** Basic information on the VLBA observations: Col. 1: source name (B1950); Col. 2: Observed frequency; Col. 3: Date of observations; Col. 4: missing antenna; Cols. 5 and 6: shortest and longest projected baselines; Cols. 7-9: beam major and minor axis and PA of the full resolution images; Col. 10: 1 $\sigma$ rms noise level on the full resolution image plane.
Source	$\nu$	Obs. date	Missing	$u_{\rm min}$	$u_{\rm max}$		Beam		Noise
B1950	GHz		antennas	M $\lambda$	M $\lambda$	mas	mas	$\circ$	mJy/beam
(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
B0147+400	1.407	09/06/2004		0.16	41	9.3	5.3	-3	0.21
	1.643			0.18	50	8.3	4.7	-4	0.38
	4.543			0.49	110	2.9	1.7	-7	0.11
	4.893			0.50	140	2.7	1.6	-5	0.10
	8.115			0.99	230	1.7	1.0	5	0.08
	8.493			1.05	250	1.6	0.9	5	0.07
B0840+424	1.407	11/24/2004	HN	0.15	40	12.0	7.5	-2	0.19
	1.643		HN	0.18	46	10.5	6.9	0	0.17
	4.543		SC	0.48	110	3.5	1.9	-20	0.15
	4.893		SC	0.50	125	3.4	1.8	-20	0.14
	8.115		SC	0.83	210	2.0	1.6	-23	0.16
	8.493		SC	0.88	230	2.0	1.5	-18	0.12

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