| HVG | Horizontal Visibility Graph |
| UHVG | Undirected Horizontal Visibility Graph |
| DHVG | Directed Horizontal Visibility Graph |
| KLD | Kullback–Leibler Divergence |
| AGN | Active Galactic Nuclei |
| OVRO | Owens Valley Radio Observatory |
| BL Lac | BL Lacertae |
| FSRQ | Flat-Spectrum Radio Quasars |
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