Fig. 15.

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Results of fitting Gaussians to the NICER pulse profiles. Top: strength of the two main peaks (red and blue) and secondary features (yellow). The first peak is defined as the sum of the first and last Gaussian, the second one as the second and third Gaussian. All other Gaussians are summed as secondary features. Middle: ratio between the strength of the secondary and primary peak. Bottom: position of all fitted Gaussians. The two observations with ObsID 4201960113 and 4201960150, selected also for Fig. 14, are marked by larger gray rings.
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