Table 6: Chemical abundances of the knots.
Knot C WHT C INT N WHT N INT #7 WHT #7 INT #1 #3 #8 #13 #14 #15
12+log O/Ha 8.57 8.53 8.23 8.24 8.55 8.53 8.50: 8.52: 8.41 8.47 8.43 8.44
12+log O/Hb 8.79 8.78 8.31 8.32 8.52 8.54 8.59 8.58 8.63 8.57 8.62 8.68
(O+++O+)/O+ 1.55 1.53 1.53 1.99 2.19 1.85 ... ... 1.57 1.64 1.61 1.67
12+log N/H 7.76 7.71 6.77 6.90 7.48 7.43 ... ... 7.33 7.48 7.32 7.32
- log N+/O+ 0.81 0.83 1.46 1.34 1.08 1.10 ... ... 1.08 0.99 1.11 1.00
12+log Ne++/H+ 7.67 7.60 7.53 7.42 7.56 7.79 ... ... ... ... ... ...
12+log S+/H+ 6.54 6.50 6.24 6.07 6.31 6.34 ... ... 6.38 6.44 6.33 6.45
12+log S++/H+ 6.42 ... ... ... ... ... ... ... ... ... ... ...
12+log He+/H+c 10.84 10.88 10.97 11.03 10.82 10.94 ... ... ... ... 10.91 ...
[O/H]/[O/H]$_{\odot}$d 0.76 0.69 0.35 0.35 0.72 0.69 0.72: 0.65: 0.60 0.71 0.55 0.56
a Determined using the empirical calibration of Pilyugin (2001).
b Determined using the [N II]/H$\alpha $ ratio (Denicoló et al. 2002).
c Using only the He I $\lambda $5875 emission line.
d Asuming 12+$\log$[O/H]$_{\odot}$ = 8.69$\pm0.05$ (Allende Prieto et al. 2001).

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