Note:

Observed at Kinneret Observatory with a one-shot colour camera; the red channel of the Bayer matrix, used as an approximation to Johnson R. No colour transformation was applied.
Differential magnitudes, instrumental zero point (target minus an ensemble of 12 comparison stars).
A companion 11.8 px from the target contributes light inside the aperture, so the measured depth is diluted and is a lower limit.
In this channel the target's smooth variation is only 1.3 times that of the comparison stars, so the dip is not established here; the curve is published as data, not as a detection.
A field star falls in the target's sky annulus; the annulus was widened to 26.3-29.7 px to exclude it.
The meridian flip falls inside the series; 5 frames were taken after it.