Distribution of BICs of the 52 lensing models. BICs of two-image systems are represented by histograms, while vertical orange lines indicate the BICs of the two quad systems. In the square panels, blue circles show the observed image positions, orange circles show the modelled image positions, and green diamonds show the source positions given by the lens models. The green and red curves indicate the caustic and critical curves of the corresponding lensing models.