Upper figure: pulse profile of the time series, merged from all EPIC instruments in different energy bands for the 2012 observation (black) and an observation in 2010 (red). The individual light curves are background subtracted and normalised to the average count rate (from top to bottom: 0.19, 0.40, 0.44, 0.35, 1.37 cts s^-1 in 2012 and 0.020, 0.044, 0.052, 0.037, 0.15 cts s^-1 in 2010). Lower figure: hardness ratios as function of pulse phase.