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Fig. 11.

image

Second absorption feature centroid energy (in keV) and its optical depth variations as a function of pulse phase obtained from NuObs1, NuObs2, NuObs3+P0211006008, and NuObs4. The pulse profile of each observation is shown in grey. For each observation, the width of the second absorption feature σabs2 was fixed to its phase-averaged value.

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