Continuum-normalized spectrum for different absorption transitions along QSO 0102−2209 at d = 1090 pkpc (0.7R_vir) from the center of A133. The absorption transition is identified in the bottom right corner of each panel. Zero velocity marks the redshift of A133 at z = 0.05584. The 1σ error spectrum is included in purple above the zero-flux level. Contaminating features (Galactic C II λ1334 and an unassociated intervening absorber) have been grayed out for clarity. We find no evidence of the presence of cooler gas within ±2500 km s⁻¹ from the cluster redshift, with a sensitive 2σ column density upper limit of log (N_{H I}/cm⁻²) < 13.7 for neutral hydrogen H I absorption. The 2σ upper limits on these absorption transitions are plotted in red curves for a single-component Voigt profile with b = 20 km s⁻¹.