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Table 1

Analysed quasars.

Quasar z em z Lyα a z Lyαβ b z Ly, high−order c Excluded zC ivd S/N per pixele LL (Å) Notes
Q0055–269 3.655f 2.936–3.605 2.936–3.205 not used 50–80 [..., ...] 2288
PKS2126–158 3.279 2.815–3.205 2.815–3.205 50–200 [..., 170] 3457 two sub-DLAs at z = 2.768 and 2.638
Q0420–388 3.116f 2.480–3.038 2.665–3.038 2.665–3.038 2.607–2.670 100–140 [..., 120] 3754 a sub-DLA at z = 3.087
HE0940–1050 3.078 2.452–3.006 2.714–2.778 50–130 [..., 115] ≤ 3200
HE2347–4342 2.874f 2.336–2.819 2.708–2.773 100–160 [105, 120] ≤ 1160 multiple associated systems
Q0002–422 2.767 2.209–2.705 60–70 [140, 170] 3025
PKS0329–255 2.704f 2.138–2.651 40–60 [90, 90] 3157 an associated system at 4513.7 Å
Q0453–423 2.658f 2.359–2.588 90–100 [130, 120] 3022 a sub-DLA at z = 2.305
2.091–2.217
HE1347–2457 2.609f 2.048–2.553 85–100 [115, 120] 2237
Q0329–385 2.434 1.902–2.377 50–55 [(50, 85), ...] ≤ 3050
HE2217–2818 2.413 1.886–2.365 1.971–2.365 1.970–2.365 65–120 [125, ...] 2471
Q0109–3518 2.405 1.905–2.348 1.974–2.348 1.968–2.348 60–80 [(80, 140), ...] 2163
HE1122–1648 2.404 1.891–2.358 1.974–2.358 1.900–2.358 70–170 [240, ...] ≤ 1629
J2233–606 2.250 1.756–2.197 1.980–2.201 1.970–2.201 not used 30–50 [..., ...] ≤ 1750
PKS0237–23 2.223f 1.765–2.179 1.974–2.179 1.961–2.179 75–110 [(130, 200), ...] ≤ 3050 a sub-DLA at z = 1.673
PKS1448–232g 2.219 1.719–2.175 1.974–2.175 1.953–2.175 30–90 [(70, 120), ...] ≤ 3050
Q0122–380 2.193 1.700–2.141 1.977–2.141 1.977–2.141 30–80 [(85, 130), ...] ≤ 3052
Q1101–264 2.141 1.882–2.097 1.970–2.097 1.900–2.097 80–110 [90, ...] 2597 a sub-DLA at z = 1.839

Notes.

(a)

The redshift range of the Lyα forest region analysed for the number density evolution in the Lyα-only fit. For the differential column density evolution, we used the redshift range listed in Col. 5.

(b)

The redshift range for which the high-order Lyman fit can be performed is listed only when it is different from the Lyα-only fit region.

(c)

The redshift range of the Lyα forest region analysed for the high-order Lyman fit is listed only when it is different from the Lyα-only fit region.

(d)

The redshift range excluded for the C iv-enriched H i forest analysis in Sect. 5 due to the lack of the coverage. Q0055−269 and J2233−606 are excluded due to their lower S/N in the C iv region. No entries mean that the analyzed zC iv is the same as the one in Col. 5.

(e)

The number outside the bracket is a S/N of the H i forest region. The first number inside the bracket is a typical S/N of the C iv region at 1.9 < z < 2.4, while the second is for 2.4 < z < 3.2. The dotted entries indicate that no C iv forest region is available for a given redshift range. Two numbers inside the parentheses indicate the S/N of the C iv region at 1.9 < z < 2.1 and 2.1 < z < 2.4, respectively, due to the dichroic setting toward some sightlines.

(f)

Due to the absorption systems at the peak of the Lyα emission line or to the non-single-peak emission line, the measurement is uncertain.

(g)

Part of the continuum uncertainties toward shorter wavelengths is due to the local, non-smooth continuum shape, partly due to a lower S/N (~30–35).

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