Sample spectra taken from the z = 3 low luminosity QSO located in a void showing the radiative transfer simulations including the proximity effect (solid line) and without it (dashed line). The spectra are given in log ω scale and for better visibility, no noise has been added to the spectra. The normalised optical depths ξ at each log ω bin is overplotted by solid dots to show the effect of absorption features on ξ. The dashed vertical line marks the start of the unreliability region of log ω ≥ 2.4.