Discovery data of MASCARA-4 b/bRing-1 b. Top left: BLS periodogram of the combined MASCARA and bRing photometry obtained between mid-2017 and the end of 2018. The blue dashed lines represent harmonics of the main periodic signal. Top right: same zoomed-in on the peak in the periodogram, which is located at 0.354 days⁻¹. Bottom left: calibrated MASCARA and bRing data, phase folded to a period of 2.82407 days. The blue dots are binned such that there are nine data points in transit, which comes out to phase steps of ~0.005. The red lineshows the BLS fit on the data. Bottom right: same zoomed-in on the transit event.