Fig. 2
and 
plots for 1H 1426+428 (black filled squares) compared with those of Mrk 421 (orange circles). Black lines indicate the regressions underlying the rlog correlation coefficient. Circled values refers to the peculiar observation performed on the 16 June 2001 by XMM-Newton (see Massaro et al. 2008, A&A, 478, 395, for more details).
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