Our quasar sample consists of 205 objects. Our CSNG is constructed using the GAMA archival data and consists of 200 sets, where each set has 205 normal galaxies. The CSNG is from the same volume as the quasar sample. The redshift and stellar mass properties are matched to the quasar sample as well (Figure 3). The quasar sample is obtained from C. F. Wethers et al. (2022), and the CSNG is obtained from M. B. Stone et al. (2023).