Top panels: angle-averaged EBL photon energy density spectra for a homogeneous EBL (solid lines) and in the presence of a spherical cosmic void (dashed lines) with its center at redshift z_v = 0.5 (comoving distance of 1.724 Gpc) and with radius R = 50 h⁻¹ Mpc (left) and R = 100 h⁻¹ (right). Green curves indicate locations in front of the void, red curves those within the void, and blue curves those behind the void. Bottom panels: relative deficit of the EBL energy density due to the void.