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Table 3:

The data for the USNO PN sample.
Name Trigonometric parallax $S_{\rm 5~GHz}$ Diameter
  [mas] [mJy] [ $^{\prime\prime}$]

NGC 7293 (036.1-57.1)
$4.56\pm0.49$ 1292a 660b
NGC 6853 (060.8-03.6) $3.81\pm0.47$ 1325a 340a
NGC 6720 (063.1+13.9) $1.42\pm0.55$ 0384a 060c
A 21 (205.1+14.2) $1.85\pm0.51$ 0157d 550e
A 7 (215.5-30.8) $1.48\pm0.42$ 0305a 760a
A 24 (217.1+14.7) $1.92\pm0.34$ 0036a 415d
a Cahn et al. (1992); b O'Dell (1998);
c George et al. (1974); d Hua & Kwok (1999);
e Salter et al. (1984).

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