**Table 4:** Ionic concentrations and chemical abundances in Mz 3. Wavelength in Angstrom for all values of $\lambda$ above 1000, otherwise in $\mu$ m.
Ion	$\lambda$	I	T	$N_{{\rm ion}}$ / $N_{{\rm p}}$	ICF	$N_{{\rm el.}}$ / $N_{{\rm p}}$
He⁺	5875	12.0	9 000	0.080
C⁺	157.6	$\leq$ 4.67.	7 000	$\leq$ 1.19(-3)
C⁺⁺	4267	0.377	10 000	4.2(-4)	1	$\leq$ 1.6(-3)
N⁺	6584	465.	7 000	2.46(-4)
N⁺	122.	3.61	7 000	2.67(-4)
N⁺⁺	57.3	9.7	12 000	4.97(-5)	1	3.0(-4)
O⁺	3726	42.	7 000	2.06(-4)
O⁺⁺	5007	21.5	12 000	6. (-6)
O⁺⁺	51.8	6.4	12 000	2.25(-5)	1	2.3(-4)
Ne⁺	12.8	64.	8 000	1.15(-4)
Ne⁺⁺	15.5	4.2.	12 000	4.18(-6)
Ne⁺⁺	3869	1.4	12 000	1.7(-6)	1	1.2(-4)
S⁺	6731	13.5	7 000	2.04(-6)
S⁺⁺	6312	0.84	8 000	5.3(-6)
S⁺⁺	18.7	48.1	8 000	5.82(-6)
S⁺⁺	33.5	21.0	8 000	7.09(-6)	1.2	1.0(-5)
Ar⁺	6.99	28.5	7 500	4.02(-6)
Ar⁺⁺	7136	7.1	11 000	7.0(-7)
Ar⁺⁺	8.99	8.24	11 000	1.03(-6)	1	5.0(-6)
Cl⁺⁺	5538	0.45	8 000	1.3(-7)	1.4	1.8(-7)
Fe⁺	25.9	2.3	7 000	6.27(-7)
Fe⁺³	22.9	10.8	8 000	4.52(-6)	1.5	7.8(-6)
Si⁺	34.8	8.33	7 000	5.8(-6)	3:	1.8(-5)

Intensities (I) given with respect to H $\beta=100$ . The colon ":'' indicates
an uncertain correction for the missing ionization stages.

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