The normalised optical depth for the L_νLL = 10³¹   erg   Hz^-1   s^-1 QSO with the standard SED residing in a halo at z = 3. Continuous lines show the fitted profiles. The triangles and dash-dotted line indicate the radiation transfer proximity effect without the use of the SED correction term. The circles and dotted line provide the radiation transfer results including the SED correction. The QSO with the hard α_q = −1.5 SED is given by the squares and dashed line. The original BDO model is shown as the solid line. The dotted error bars show the sample standard deviation. The solid errors show the 2σ error in the mean.