Astronomy & Astrophysics

**Table 3:** Component structure of the $z_{\rm abs} = 2.309$ DLA system toward Q0100+13.
No.	$z_{\rm abs}$	$v_{\rm rel}^*$	$b (\sigma_b)$	Ion	$\log N (\sigma_{\log N})$
		km s^-1	km s^-1
Low-ion transitions
1	2.309027	0	5.6 (0.1)	Fe II	14.86 (0.01)
				Zn II	12.28 (0.01)
				Cr II	13.15 (0.01)
				S II	14.85 (0.05)
				Ar I	13.99 (0.15)
				P II	12.88 (0.08)
				N I	14.79 (0.08)
				Mg II	15.41 (0.07)
2	2.309161	+12	5.3 (0.1)	Fe II	14.61 (0.01)
				Zn II	12.03 (0.02)
				Cr II	12.96 (0.01)
				S II	14.73 (0.08)
				Ar I	13.81 (0.08)
				P II	12.55 (0.10)
				N I	14.65 (0.12)
				Mg II	15.06 (0.13)
3	2.309443	+37	14.1 (0.2)	Fe II	14.02 (0.03)
4	2.309486	+52	2.8 (0.3)	Fe II	12.96 (0.03)
Intermediate-ion transitions
1	2.308980	-4	6.0 (1.9)	Al III	12.18 (0.12)
				Fe III	<13.28
				N II	<13.24
2	2.309093	+6	11.2 (1.2)	Al III	12.22 (0.08)
				Fe III	<13.22
				N II	<13.64
3	2.309498	+43	13.0 (1.9)	Al III	12.12 (0.05)

^* Velocity relative to z=2.309027.