XMM-Newton spectrum and best-fit results of X-2012-10-18. Upper panel a) EPIC pn (blue) and MOS (gray) data, as well as corresponding best fits for an absorbed power law evaluated over (0.5–10) keV (black solid line) and (2–10) keV (black dashed line). Mid panel b) Data-to-model ratio for the best fit over the whole (0.5–10) keV energy range. Lower panel c) Respective residuals for fitting the (2–10) keV energy range alone, extrapolated to lower energies. A tentative soft excess below 0.6 keV is only observed for X-2004-04-11 (compare shaded regions).