Changes in the slope α as a function of the observed flux for components A (upper panel) and B (lower panel). Open circles denote the photometric data taken from Shalyapin et al. (2012). Solid squares denote our observations (BTA) and solid triangles the observations with LRT given in the database of bright quasars (see Gil-Merino et al. 2018). The BTA and LRT observations were conducted in the spectral mode, which explains the significant errorbars.