The Herschel Planetary Nebula Survey (HerPlaNS) - I. Data overview and analysis demonstration with NGC 6781

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Table 6

Spatially resolved (T_e, n_e) in the H ii region of NGC 6781.

Position^a	ΔRA^b	n_e[O iii]	n_e[O i]	n_e[N ii]	T_e[O iii]	T_e[N ii]
	(arcsec)	(cm^-3)	(cm^-3)	(cm^-3)	(K)	(K)

Cen5	−20	530 ± 80	1520 ± 400	370 ± 90	9670 ± 10	8300 ± 80
Cen4	−10	320 ± 30	820 ± 420	220 ± 40	9690 ± 20	7990 ± 70
Cen3	0	350 ± 40	< 600	80 ± 10	9800 ± 10	7920 ± 60
Cen2	10	410 ± 70	...	105 ± 20	9730 ± 10	8240 ± 60
Cen1	20	350 ± 40	1920 ± 670	220 ± 50	9780 ± 10	8250 ± 70
Rim5	30	400 ± 60	650 ± 270	960 ± 430	9920 ± 10	8730 ± 50
Rim4	40	270 ± 40	< 300	300 ± 80	10 000 ± 10	9410 ± 40
Rim3	50	220 ± 80	1270 ± 80	640 ± 210	10 940 ± 30	11 580 ± 60
Rim2	60	...	...	450 ± 130	7400 ± 60	6250 ± 50
Rim1	70	...	< 300	...	5700 ± 100	4780 ± 240

Notes.

^(a)

Position along the RA direction defined by integer multiples of 10′′ from the nebula center, at which the surface line strength is summed over the 5-spaxel column along the DEC direction (also indicated at the top of Fig. 12).

^(b)

Relative angular distance in the RA direction from the center spaxel of the center pointing.

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