Phase-folded Gaia G CCD light curve of the PCEB NN Ser (panel a), and zoom onthe fading transit that is visible at phase around 0.3 (panel b). “Times” are expressed in BJD in TCB − 2455197.5 d. The reference time used to fold the Gaia light curve is 1738.448 d (in BJD in TCB − 2455197.5 d).
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