Version 6. 1: Adds three publication-quality figures. Fig. 1: GMM decomposition of 515 ISP blazars + VI vs FracVar scatter (C3 highlighted). Fig. 2: 3C 66A Swift XRT light curve, HR time series, and spectral comparison. Fig. 3: Three-source comparison (Fvar, spectral softening, KS significance). Full paper PDF with all figures integrated. DOI v6. 0: 10. 5281/zenodo. 19788559
Yoshimitsu Katayama (Sun,) studied this question.
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