Residuals of single orbital profiles from the template in the 4−10 keV energy band for the Y phase-bin (see text). The residuals are compared to the observation time on the x-axis. The thin black line is the zero-value, while the red dashed line is the 30% limit below which the selection criterion in the Y phase-bin is fullfilled. Error bars correspond to the sample standard deviation (σ/, with N number of data points). Not all the profiles below the red dashed line are selected as double-peaked profiles because of the conditions imposed on the X and Z phase-bins.