Position-recovery accuracy for a simulation with injection in the “neighbourhood” of PCCS2+2E source locations. Upper left panel: distance between the injection and recovered position, normalized by the estimated uncertainty (POSERR), as a function of NPSNR. The blue points represent the PCCS2 and the magenta the full PCCS2+2E. Upper right panel: same but after applying to POSERR the correction suggested in Eq. (B.3) with (here green is PCCS2 and red is PCCS2+2E). Lower left panel: POSERR for both sets, corrected and uncorrected, as a function of NPSNR. The horizontal dashed line is the positional precision saturation constant σ₀. Lower right panel: histogram of the separation between the injected and estimated source position, normalized by the corrected position error bar. The distribution is consistent with a unitary Rayleigh distributions with a minor excess in the tail.