Fig. 4.
Amplitude spectra of RX J2117 showing rotational multiplets. The panels present rotational splittings in different regions in the amplitude spectra with an average splitting δν = 5.570 μHz. The last panel (bottom right) presents the window function of RX J2117 for the frequency 1217.872 μHz. The horizontal dashed blue line shows the confidence level of 0.1% FAP. The red lines are residuals after extraction of the signals.
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