Evolution of black-body model spectral parameters for observations obtained during out-of-periastron regime. From top to bottom: X-ray luminosity (0.5−10 keV), black-body temperature, and corresponding emission region radii (values that were fixed during the spectral fits are not shown; see Sect. 2.2.1). The zero-points correspond to the dates of the end of the outbursts: 2015 November 20 (MJD 57346) for the 2015/2016 campaign and 2017 September 5 (MJD 58001) for the 2017/2018 campaign. The blue and red colours indicate the 2015/2016 and 2017/2018 data sets, respectively. Our XMM-Newton observations are shown with an up-pointing triangle (light blue; 2015/2016 campaign) and a square (red; 2017/2018 campaign). Errors are 1σ confidence levels. In some cases, the errors are smaller than the symbol. The horizontal dotted lines indicate the representative values measured during the 2007 quiescent XMM-Newton observation.
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