Table 2: The results of model-fitting at six epochs.
Freq. (GHz) Comp. S (Jy) R (mas) $\theta$ (deg) Major (mas) Axial Ratio $\phi$ (deg) $T_{\rm b}$ (K)
(1) (2) (3) (4) (5) (6) (7) (8) (9)

Epoch 2001.20,   $\chi^2_{\nu, 2.3}=2.36$,  $\chi^2_{\nu, 8.4}=1.76$,  $\chi^2_{\nu, 22}=2.22$

2.3		 k 0.517 $\pm$ 0.052 0 0 0.37 $\pm$ 0.04 1.0 0 $1.26\times10^{12}$
  d 0.206 $\pm$ 0.021 1.99 $\pm$ 0.03 - $176.1\pm0.6$ 0.68 $\pm$ 0.03 1.0 0 $1.48\times10^{11}$
  e 0.055 $\pm$ 0.006 5.85 $\pm$ 0.29 171.5 $\pm$ 0.04 3.27 $\pm$ 0.05 1.0 0 $1.71\times10^{9}$
  f 0.045 $\pm$ 0.005 12.69 $\pm$ 0.63 164.3 $\pm$ 0.6 3.66 $\pm$ 0.07 1.0 0 $1.11\times10^{9}$
  g 0.034 $\pm$ 0.0034 20.01 $\pm$ 1.00 166.5 $\pm$ 0.4 10.03 $\pm$ 0.31 1.0 0 $1.12\times10^{8}$
8.4 k 0.564 $\pm$ 0.057 0 0 0.023 $\pm$ 0.010 1.0 0 $2.66\times10^{13}$
  b 0.143 $\pm$ 0.014 0.71 $\pm$ 0.01 - $166.0\pm0.1$ 0.19 $\pm$ 0.01 1.0 0 $9.89\times10^{10}$
  d 0.105 $\pm$ 0.011 2.22 $\pm$ 0.01 -174.7 $\pm$ 0.1 0.59 $\pm$ 0.01 1.0 0 $7.53\times10^{9}$
  e 0.028 $\pm$ 0.003 6.06 $\pm$ 0.30 170.2 $\pm$ 0.6 3.44 $\pm$ 0.15 1.0 0 $5.91\times10^{7}$
  f 0.039 $\pm$ 0.004 12.57 $\pm$ 0.63 165.3 $\pm$ 0.5 5.16 $\pm$ 0.25 1.0 0 $3.66\times10^{7}$
  g 0.017 $\pm$ 0.0017 23.68 $\pm$ 1.18 159.7 $\pm$ 0.8 7.03 $\pm$ 0.62 1.0 0 $8.59\times10^{6}$
22.2 k 0.626 $\pm$ 0.12 0 0 0.025 $\pm$ 0.002 1.0 0 $3.58\times10^{12}$
  a 0.160 $\pm$ 0.032 0.29 $\pm$ 0.01 -165.0 $\pm$ 0.2 0.14 $\pm$ 0.01 1.0 0 $2.92\times10^{12}$
  b 0.041 $\pm$ 0.0082 0.74 $\pm$ 0.02 -168.9 $\pm$ 0.3 0.042 $\pm$ 0.01 1.0 0 $2.31\times10^{10}$
  c 0.054 $\pm$ 0.011 1.14 $\pm$ 0.01 -165.5 $\pm$ 0.2 0.33 $\pm$ 0.01 1.0 0 $1.77\times10^{9}$
  d 0.089 $\pm$ 0.022 2.27 $\pm$ 0.01 -173.4 $\pm$ 0.3 0.53 $\pm$ 0.01 1.0 0 $1.13\times10^{9}$

Epoch 2001.48,  $\chi^2_{\nu, 2.3}=1.84$,  $\chi^2_{\nu, 8.4}=1.76$,  $\chi^2_{\nu, 22}=1.83$

2.3		 k 0.481 $\pm$ 0.048 0 0 0.35 $\pm$ 0.05 1.0 0 $1.31\times10^{12}$
  d 0.205 $\pm$ 0.021 2.07 $\pm$ 0.03 -179.4 $\pm$ 0.3 0.45 $\pm$ 0.07 1.0 0 $3.37\times10^{11}$
  e 0.055 $\pm$ 0.006 6.85 $\pm$ 0.34 166.6 $\pm$ 0.3 3.62 $\pm$ 0.06 1.0 0 $1.40\times10^{9}$
  f 0.048 $\pm$ 0.005 13.95 $\pm$ 0.70 165.0 $\pm$ 0.3 5.10 $\pm$ 0.06 1.0 0 $6.14\times10^{8}$
  g 0.019 $\pm$ 0.0019 23.74 $\pm$ 1.19 165.1 $\pm$ 0.2 5.01 $\pm$ 0.36 1.0 0 $2.52\times10^{8}$
8.4 k 0.637 $\pm$ 0.064 0 0 0.12 $\pm$ 0.01 1.0 0 $1.10\times10^{12}$
  b 0.161 $\pm$ 0.016 0.80 $\pm$ 0.01 -166.7 $\pm$ 0.1 0.30 $\pm$ 0.02 1.0 0 $4.47\times10^{10}$
  d 0.120 $\pm$ 0.012 2.28 $\pm$ 0.02 -175.2 $\pm$ 0.1 0.58 $\pm$ 0.02 1.0 0 $8.91\times10^{9}$
  e 0.038 $\pm$ 0.004 6.458 $\pm$ 0.32 168.6 $\pm$ 0.4 3.33 $\pm$ 0.07 1.0 0 $8.56\times10^{7}$
  f 0.048 $\pm$ 0.005 12.75 $\pm$ 0.64 163.3 $\pm$ 0.9 7.16 $\pm$ 0.29 1.0 0 $2.34\times10^{7}$
  g 0.001 $\pm$ (>0.001) 21.98 $\pm$ 1.10 164.8 $\pm$ 0.1 2.49 $\pm$ 0.12 1.0 0 $4.03\times10^{6}$
22.2 k 0.624 $\pm$ 0.12 0 0 0.097 $\pm$ 0.003 1.0 0 $2.37\times10^{11}$
  a 0.143 $\pm$ 0.029 0.42 $\pm$ 0.01 -165.7 $\pm$ 0.2 0.21 $\pm$ 0.01 1.0 0 $1.16\times10^{10}$
  b 0.002 $\pm$ (>0.002) 0.81 $\pm$ 0.02 -165.0 $\pm$ 0.3 0.20 $\pm$ 0.01 1.0 0 $1.79\times10^{8}$
  c 0.052 $\pm$ 0.010 1.16 $\pm$ 0.01 -168.8 $\pm$ 0.1 0.35 $\pm$ 0.02 1.0 0 $1.52\times10^{9}$
  d 0.064 $\pm$ 0.013 2.31 $\pm$ 0.01 -173.7 $\pm$ 0.1 0.45 $\pm$ 0.01 1.0 0 $1.13\times10^{9}$

Epoch 2001.86,  $\chi^2_{\nu, 2.3}=1.12$,  $\chi^2_{\nu, 8.4}=1.11$

2.3		 k 0.591 $\pm$ 0.060 0 0 0.53 $\pm$ 0.02 1.0 0 $7.00\times10^{11}$
  d 0.226 $\pm$ 0.023 2.0 $\pm$ 0.02 -176.9 $\pm$ 0.2 0.92 $\pm$ 0.04 1.0 0 $8.89\times10^{10}$
  e 0.051 $\pm$ 0.005 6.43 $\pm$ 0.32 169.3 $\pm$ 0.3 2.93 $\pm$ 0.09 1.0 0 $1.98\times10^{9}$
  f 0.060 $\pm$ 0.006 12.72 $\pm$ 0.76 165.1 $\pm$ 0.2 5.30 $\pm$ 0.10 1.0 0 $7.11\times10^{8}$
  g 0.028 $\pm$ 0.0028 22.01 $\pm$ 1.10 165.7 $\pm$ 0.4 8.35 $\pm$ 0.34 1.0 0 $1.34\times10^{8}$
8.4 k 0.632 $\pm$ 0.063 0 0 0.10 $\pm$ 0.01 1.0 0 $1.58\times10^{12}$
  b 0.141 $\pm$ 0.014 0.76 $\pm$ 0.01 -166.4 $\pm$ 0.2 0.27 $\pm$ 0.01 1.0 0 $4.83\times10^{10}$
  d 0.117 $\pm$ 0.012 2.21 $\pm$ 0.02 -174.0 $\pm$ 0.1 0.71 $\pm$ 0.01 1.0 0 $5.79\times10^{9}$
  e 0.044 $\pm$ 0.004 6.26 $\pm$ 0.31 169.6 $\pm$ 0.5 4.09 $\pm$ 0.21 1.0 0 $6.57\times10^{7}$
  f 0.032 $\pm$ 0.003 13.32 $\pm$ 0.67 164.8 $\pm$ 0.4 4.40 $\pm$ 0.21 1.0 0 $4.13\times10^{7}$
  g 0.022 $\pm$ 0.0022 22.57 $\pm$ 1.13 166.8 $\pm$ 0.9 8.58 $\pm$ 1.03 1.0 0 $7.46\times10^{6}$

Epoch 2002.11,  $\chi^2_{\nu, 2.3}=1.05$,  $\chi^2_{\nu, 8.4}=0.98$

2.3		 k 0.522 $\pm$ 0.052 0 0 0.10 $\pm$ 0.08 1.0 0 $1.74\times10^{13}$
  d 0.248 $\pm$ 0.025 1.81 $\pm$ 0.02 -174.8 $\pm$ 0.2 0.94 $\pm$ 0.05 1.0 0 $9.35\times10^{10}$
  e 0.057 $\pm$ 0.006 6.27 $\pm$ 0.31 169.3 $\pm$ 0.2 3.00 $\pm$ 0.13 1.0 0 $2.11\times10^{9}$
  f 0.054 $\pm$ 0.005 13.07 $\pm$ 0.65 165.0 $\pm$ 0.2 5.05 $\pm$ 0.12 1.0 0 $7.05\times10^{8}$
  g 0.030 $\pm$ 0.0030 21.68 $\pm$ 1.08 166.1 $\pm$ 0.4 8.56 $\pm$ 0.34 1.0 0 $1.36\times10^{8}$
8.4 k 0.555 $\pm$ 0.060 0 0 0.14 $\pm$ 0.01 1.0 0 $7.07\times10^{11}$
  b 0.148 $\pm$ 0.015 0.76 $\pm$ 0.01 -166.3 $\pm$ 0.1 0.32 $\pm$ 0.04 1.0 0 $3.61\times10^{10}$
  d 0.118 $\pm$ 0.012 2.17 $\pm$ 0.02 -173.4 $\pm$ 0.2 0.70 $\pm$ 0.02 1.0 0 $6.01\times10^{9}$
  e 0.042 $\pm$ 0.004 6.28 $\pm$ 0.31 170.4 $\pm$ 0.4 3.89 $\pm$ 0.13 1.0 0 $6.93\times10^{7}$
  f 0.04 $\pm$ 0.004 13.37 $\pm$ 0.67 165.4 $\pm$ 0.4 5.22 $\pm$ 0.68 1.0 0 $3.66\times10^{7}$
  g 0.015 $\pm$ 0.0015 23.04 $\pm$ 1.15 167.3 $\pm$ 1.0 8.24 $\pm$ 0.19 1.0 0 $5.52\times10^{6}$

Epoch 2002.14,  $\chi^2_{\nu, 2.3}=1.17$,  $\chi^2_{\nu, 8.4}=1.11$

2.3		 k 0.402 $\pm$ 0.040 0 0 0.20 $\pm$ 0.06 1.0 0 $3.35\times10^{12}$
  d 0.243 $\pm$ 0.024 1.79 $\pm$ 0.03 -176.7 $\pm$ 0.2 0.92 $\pm$ 0.04 1.0 0 $9.56\times10^{10}$
  e 0.052 $\pm$ 0.005 6.19 $\pm$ 0.31 168.0 $\pm$ 0.3 2.94 $\pm$ 0.10 1.0 0 $2.00\times10^{9}$
  f 0.056 $\pm$ 0.006 12.83 $\pm$ 0.64 164.9 $\pm$ 0.3 5.25 $\pm$ 0.13 1.0 0 $6.77\times10^{8}$
  g 0.030 $\pm$ 0.0030 22.0 $\pm$ 1.1 166.6 $\pm$ 0.5 8.35 $\pm$ 0.47 1.0 0 $1.43\times10^{8}$
8.4 k 0.529 $\pm$ 0.053 0 0 0.14 $\pm$ 0.01 1.0 0 $6.74\times10^{11}$
  b 0.137 $\pm$ 0.014 0.78 $\pm$ 0.01 -166.9 $\pm$ 0.2 0.33 $\pm$ 0.01 1.0 0 $3.14\times10^{10}$
  d 0.118 $\pm$ 0.012 2.16 $\pm$ 0.01 -173.5 $\pm$ 0.1 0.56 $\pm$ 0.01 1.0 0 $9.39\times10^{9}$
  e 0.043 $\pm$ 0.004 6.39 $\pm$ 0.32 170.5 $\pm$ 0.6 3.72 $\pm$ 0.14 1.0 0 $7.76\times10^{7}$
  f 0.037 $\pm$ 0.004 13.21 $\pm$ 0.66 165.3 $\pm$ 0.5 5.02 $\pm$ 0.29 1.0 0 $3.66\times10^{7}$
  g 0.026 $\pm$ 0.0026 23.0 $\pm$ 1.15 165.6 $\pm$ 1.5 10.52 $\pm$ 1.4 1.0 0 $5.86\times10^{6}$

Epoch 2002.45,  $\chi^2_{\nu, 2.3}=1.06$,  $\chi^2_{\nu, 8.4}=1.05$

2.3		 k 0.429 $\pm$ 0.043 0 0 0.30 $\pm$ 0.05 1.0 0 $1.59\times10^{12}$
  d 0.209 $\pm$ 0.021 1.98 $\pm$ 0.03 -174.9 $\pm$ 0.2 0.81 $\pm$ 0.04 1.0 0 $1.06\times10^{11}$
  e 0.054 $\pm$ 0.005 6.47 $\pm$ 0.32 168.6 $\pm$ 0.3 2.90 $\pm$ 0.08 1.0 0 $2.14\times10^{9}$
  f 0.056 $\pm$ 0.006 13.14 $\pm$ 0.66 165.3 $\pm$ 0.3 5.32 $\pm$ 0.13 1.0 0 $6.59\times10^{8}$
  g 0.031 $\pm$ 0.0031 22.1 $\pm$ 1.10 165.6 $\pm$ 0.6 10.12 $\pm$ 0.45 1.0 0 $1.01\times10^{8}$
8.4 k 0.447 $\pm$ 0.045 0 0 0.20 $\pm$ 0.01 1.0 0 $2.79\times10^{11}$
  b 0.136 $\pm$ 0.014 0.79 $\pm$ 0.02 -165.9 $\pm$ 0.2 0.37 $\pm$ 0.01 1.0 0 $2.48\times10^{10}$
  d 0.123 $\pm$ 0.012 2.22 $\pm$ 0.02 -174.1 $\pm$ 0.2 0.75 $\pm$ 0.01 1.0 0 $5.46\times10^{9}$
  e 0.046 $\pm$ 0.005 6.62 $\pm$ 0.33 168.4 $\pm$ 0.5 4.21 $\pm$ 0.14 1.0 0 $6.48\times10^{7}$
  f 0.045 $\pm$ 0.004 13.3 $\pm$ 0.66 164.9 $\pm$ 0.4 5.27 $\pm$ 0.21 1.0 0 $4.04\times10^{7}$
  g 0.021 $\pm$ 0.0021 22.96 $\pm$ 1.15 168.7 $\pm$ 0.8 7.07 $\pm$ 1.78 1.0 0 $1.05\times10^{7}$
Notes: (1) Observing frequency; (2) component name; (3) flux density of component; (4) separation from the core (component k); (5) PA (from noth to east); (6) major axis of the elliptical Gaussian component; (7) ratio of the minor to major axes; (8) position angle of the major axis of the elliptical Gaussian component from north to east; (9) brightness temperature according to the formula given in Shen et al. (1997).


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