Table 7: Ionic concentrations and chemical abundances in M 1-42. Wavelength in Angstrom for all values of $\lambda $ above 1000, otherwise in $\mu $m.
Ion $\lambda $ I/H $\beta^\dagger$ $N_{{\rm ion}}$/ $N_{{\rm p}}$ ICF $N_{{\rm el.}}$/ $N_{{\rm p}}$
He+ 5875 22.6 0.151    
He++ 4686 12.5 0.010 1 0.161
C++ 1909 45.6 8.8(-4) 1.2 10.5(-4)
N+ 6584 250 9.43(-5)    
N+ 122. 5.9 1.5(-4)    
N++ 57 269 5.46(-4) 1.1 7.5(-4)
O+ 3727 36.0 8.5(-5)    
O++ 5007 510 4.42(-4)    
O++ 51.8 383 7.25(-4)    
O++ 88.3 180 9.5(-4)    
O+3 25.8 91.5 2.4(-5) 1.0 8.3(-4)
Ne+ 12.8 43.5 8.0(-5)    
Ne++ 15.5 497 3.6(-4)    
Ne++ 36.0 42.8 3.6(-4)    
Ne++ 3869 68.0 1.93(-4)    
Ne+4 24.3 0.396 4.3(-8) 1 4.4(-4)
S+ 6731 20.0 1.93(-6)    
S++ 18.7 184 1.92(-5)    
S++ 6312 1.44 9.53(-6)    
S+3 10.5 321 9.3(-6) 1.0 2.8(-5)
Ar++ 21.8 4.19 7.1(-6)    
Ar++ 7135 18.4 3.14(-6)    
Ar+3 4740 1.38 1.07(-6)    
Ar+4 13.1 0.63 2.05(-8) 1.1 9.0(-6)
Cl+ 14.4 1.41 3.6(-7)    
Cl++ 5538 0.61 1.96(-7)    
Cl+3 11.8 0.844 5.8(-8) 1.0 6.1(-7)
Fe+ 26.0 0.255 6.7(-8)    
Fe++ 22.9 0.376 1.44(-7) 2: 4.0(-7):
Si+ 34.8 0.16 4.8(-6) 2: 9.6(-6):
C++ 4267 2.5 1.9(-3)    
$^\dagger$ Intensities given with respect to H$\beta=100$.
: Indicates uncertain value.

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