Fig. 6
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Comparison of normalized pulse profiles of source 4U 1901+03 studied at different energy ranges in different stages during a flare period. The observations are in temporal order from left to right: observation with OBS ID = 90501305001 and a luminosity value of 
with a pulse profile type 1; observation with OBS ID = 90502307002 and a luminosity value of 
with a pulse profile type 1 ; observation with OBS ID = 90502307004 and a luminosity value of 
with a pulse profile type 2; observation with OBS ID = 90501324002 and a luminosity value of 
with a pulse profile type 2. The measured profiles are represented by solid lines, whereas the Fourier fits are represented by dashed lines. The boundaries of the energy ranges are [0.5, 3, 6, 12, 15, 27.6, and 78] keV. The pulse profiles were shifted by hand to align the minima of the pulse profiles and coloured according to their respective pulse profile types in order to better show a comparison between them.
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