Left: this panel shows the total mass surface density projected onto the plane of the sky, which QUMOND predicts will be inferred when interpreting the baryonic distribution of galaxies and X-ray gas of the Bullet Cluster within the framework of GR. Right: total mass surface density on the plane of the sky, as recently inferred by G. Rihtaršič et al. (2026) for the Bullet Cluster through GR lensing modeling. Both figures give mass surface density values in the same units of 1.826876×10⁹ M_⊙ kpc⁻².