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Fig. 3.

image

Differential light curves of the roAp star J1640 extracted using the DOPHOT pipeline (red; top-left) and with the our TEA-PHOT pipeline (blue; top-right). These data were obtained using the SHOC instrument at SAAO on 12 June 2017. Bottom panel: difference in the S/N of the pulsation mode at 151.93 d−1 and its harmonic at 303.86 d−1 in the amplitude spectra of these two light curves.

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