Comparisons of the cylindrically averaged power spectrum of the target lightcone (left) and synthesised lightcones (middle) after the inverse quantile transform. The ratio between the two cylindrically averaged power spectra is also shown (right), with the power spectra of the synthesised lightcones reproducing that of the target lightcone within 25%, on most scales below k_∥ = 0.3 h Mpc⁻¹.