Redshift range to be considered in our simulations. The x-axis shows the redshift of a background LBG z_gal, the left y-axis shows the observed wavelength range. The two black lines show the observed wavelengths of the rest-frame 1040−1190 Å range for each z_gal, i.e., the wavelength range of Lyα forest. The right y-axis shows the redshift of a Lyα absorber detected at the corresponding observed wavelength. The orange dashed line indicates the currently planned blue wavelength limit of the instrument.