FINKER’s frequency search for CRTS J033427.7–271223. The panel on the left shows the frequency range searched, and the inset illustrates the smooth behaviour of the residuals around the minimum. The estimated best frequency and its uncertainty are shown with a black error bar. The panel on the right shows the light curve folded at the found frequency with the kernel regression fit (green line) overlaid, illustrating the algorithm’s capability to model the periodic signal accurately.