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Statistical analysis reveals a high-variability population of ISP blazars, indicating unique characteristics.
Version 6.1: Adds three publication-quality figures. Fig.1: GMM decomposition of 515 ISP blazars + VI vs Frac_Var 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
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Yoshimitsu Katayama (2026) studied this question.
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