Table 6: The emission line fluxes (H$\beta =100$).
Label line Model flux Obsd. flux     Label line Model flux Obsd. flux
      (dereddened)           (dereddened)
H 1 4861 A 100.0 100.0     He 1 5876 A 12.5 9.60
TOTL(O 4) 1402 A 10.3 33.5     O 1 6300 A 4.20 10.7
TOTL(N 4) 1486 A 40.4 36.8     O 1 6363 A 1.34 4.25
TOTL(C 4) 1549 A 714.1 502.0     S 3 6312 A 2.35 2.90
He 2 1640 A 250.3 240.0     Ar 5 6435 A 0.713 1.11
TOTL(O 3) 1665 A 15.4 34.0     N 2 6584 A 276.4 225.0
TOTL(N 3) 1750 A 27.3 41.0     S II 6716 A 7.40 6.10
TOTL(Si 3) 1888 A 18.0 19.8     S II 6731 A 14.5 12.2
TOTL(C 3) 1909 A 625.3 628.0     Ar 5 7005 A 1.53 1.85
TOTL(C 2) 2326 A 99.2 129.0     Ar 3 7135 A 15.4 25.5
Ne 4 2424 A 43.4 116.0     Ar 4 7171 A 0.078 0.26
He 2 2733 A 7.85 13.0     Ar 4 7237 A 0.059 0.40
He 2 3203 A 15.16 14.8     Ar 4 7263 A 0.065 0.20
Ne 5 3426 A 55.9 51.3     O II 7323 A 10.3 11.6
O II 3726 A 96.4 100.0     O II 7332 A 8.63 10.9
O II 3729 A 32.2 50.0     Ar 3 7751 A 3.72 4.23
Ne 3 3869 A 162.2 143.0     Cl 4 8047 A 1.01 0.82
Ne 3 3968 A 48.9 51.0     S 3 9069 A 33.9 23.8
S II 4070 A 7.00 4.86     S 3 9532 A 84.0 51.7
S II 4078 A 2.27 1.73     He 2 1.012 m 9.57 3.25
C 2 4267 A 1.27 0.43     Mg 4 4.485 m 10.7 12.0
H 1 4340 A 47.01 48.2     Ar 6 4.530 m 8.91 7.95
TOTL(O 3) 4363 A 12.2 18.4     Mg 5 5.610 m 7.65 19.2
He 1 4471 A 4.08 3.30     Ne 6 7.650 m 4.44 4.10
Fe 3 4658 A 0.104 0.130     Ar 3 9.000 m 12.2 5.98
He 2 4686 A 36.3 44.5     S 4 10.51 90.9 100.0
Ar 4 4711 A 2.18 5.80     Ne 2 12.81 m 2.69 8.08
Ne 4 4720 A 0.361 2.23     Ne 5 14.32 m 158.7 104.0
Ar 4 4740 A 3.34 7.60     Ne 3 15.55 m 189.0 166.0
O 3 5007 A 1581.5 1500.0     S 3 18.67 m 30.8 35.7
Ar 3 5192 A 0.12 0.28     Ne 5 24.31 m 66.0 90.6
N 1 5200 A 0.658 1.08     O 4 25.88 m 211.2 266.0
Cl 4 5324 A 0.017 0.130     Ne 3 36.01 m 14.4 14.4
Cl 3 5518 A 0.557 0.70     O 3 51.80 m 75.4 74.8
Cl 3 5538 A 0.887 1.40     N 3 57.21 m 25.2 27.4
N 2 5755 A 5.35 4.50     O 3 88.33 m 10.9 14.1
Absolute H$\beta$ flux  Model: $2.36\times10^{-11}$ erg cm-2 s-1; Obsn: $2.34\times10^{-11}$ erg cm-2 s-1.
$\bf {Notes}$: "A'' in Col. "Line'' signifies Angstrom; "m'' signifies $\mu $m. In Col. "Label'', we have followed the notation used by Cloudy for atoms and ions; this will make identifying a line in Cloudy's huge line list easy. Neutral state is indicated by "1'' and singly ionized state by "2'' etc., "TOTL'' typically means the sum of all the lines in the doublet/multiplet; or it could mean sum of all processes: recombination, collisional excitation, and charge transfer. Some elements are represented by usual notation as per Cloudy.

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Article Contents
1 Introduction
2 The spectrum of NGC 6886
3 Radius and luminosity of the central star
4 Chemical composition of NGC 6886 from the simplified analysis
5 Model
6 Discussion
7 Nebular abundances
8 Evolutionary state
9 Conclusion
References
List of tables
List of figures