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Table 1.

Details of the stacked spectra displayed in Fig. 1.

Redshift bin zall Nall zmore Nmore S/Nmore zless Nless SNRless Δ⟨F1070 − 1170
2.7 < z < 3.0 2.8583 749 2.8643 333 17.8 2.8548 197 11.2 0.37 0.45
3.0 < z < 3.3 3.1392 546 3.1225 188 17.3 3.1540 183 13.4 0.31 0.41
3.3 < z < 3.6 3.4315 412 3.4285 102 15.8 3.4361 181 11.6 0.29 0.44
3.6 < z < 4.0 3.8133 305 3.7901 80 13.6 3.8146 105 8.2 0.23 0.36
4.0 < z < 4.5 4.2198 274 4.2545 113 14.2 4.1693 53 7 0.28 0.44
4.5 < z < 4.8 4.6209 122 4.6157 58 8.8 4.6472 16 2.7 0.24 0.42
z > 4.8 5.0411 94 5.0707 45 5 5.0464 18 2.6 0.14 0.34

Notes. For each stack we provide the number of individual spectra entering the stacking of the spectrum (NX) and the average redshift of all these galaxies (⟨zX⟩). Quantities with “all”, “more”, and “less” refer to the stack with all the galaxies (in gray in Fig. 1), galaxies with the more transmitting IGM (blue), and galaxies with the less transmitting IGM (red). The penultimate column shows the flux difference between the more IGM-transmitted galaxies and the less IGM-transmitted galaxies, computed at 1070–1170 Å, while the last column shows the fractional difference. It is worth mentioning that Nall ≠ Nmore + Nless because we considered object strictly above (Nmore) or below (Nless) the average. Nall also includes all galaxies with an IGM absorption equal to the theoretical average. Finally, the S/N is the one computed in the stacked spectra in the IGM region at 1070–1170 Å.

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