HE–VHE γ-ray spectra of PKS 1424+240 from Archambault et al. (2014). The blue points show the EBL-corrected spectrum using the Gilmore et al. (2012) EBL model. The red points represent the reduced EBL correction using the linear scaling of τ_γγ with the line-of-sight galaxy density, as suggested by Furniss et al. (2015). The green points illustrate the reduced EBL correction resulting from our model calculation with a void of radius R = 50 h⁻¹ Mpc centered at z_v = 0.5 (comoving distance of 1.724 Gpc), assuming a source redshift of z_s = 0.6 (comoving distance of 2.056 Gpc), which results in approximately the same perceived line-of-sight galaxy underdensity used by Furniss et al. (2015). The left panels show the actual νF_ν spectra, while the right panels show the spectra normalized to the EBL-corrected flux points from Archambault et al. (2014).