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Hydrogen ionized fraction
Helium doubly-ionized fraction
Ly-alpha flux power spectrum
Mean free path of ionising photons
HI Ly-alpha effective optical depth
HeII Ly-alpha effective optical depth
HeII-to-HI column density ratio
Quasar luminosity function
Galaxy UV luminosity function
IGM temperature at mean density
CMB optical depth
Star-formation-rate density
Ly-alpha spike - galaxy correlation
Stellar metallicity as function of galaxy stellar mass
Gas-phase O/H metallicity as function of galaxy stellar mass
Star formation rate as function of galaxy stellar mass
Slope of the galaxy UV log flux density
Number of ionizing photons produced per unit UV luminosity
Photoionsation rate of hydrogen in the IGM
Emission rate of ionizing photons per unit volume
Redshift when x_HI = 0.5
Density of UV radiation in erg/s/Hz/Mpc^3