The relation for planetary nebulae | Astronomy & Astrophysics (A&A)

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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)	$4.56\pm0.49$	1292^a	660^b
NGC 6853 (060.8-03.6)	$3.81\pm0.47$	1325^a	340^a
NGC 6720 (063.1+13.9)	$1.42\pm0.55$	0384^a	060^c
A 21 (205.1+14.2)	$1.85\pm0.51$	0157^d	550^e
A 7 (215.5-30.8)	$1.48\pm0.42$	0305^a	760^a
A 24 (217.1+14.7)	$1.92\pm0.34$	0036^a	415^d

References:
^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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