First seven normalized principal components (PC; columns of the matrix U) from the background mask of TIC 374944608, sector 2. The PCs are displayed in ascending order with the first normalized PC at the bottom and manually set 0.25 units apart from each other for a better visualization. Only black normalized PCs have a level of scattering <10⁻⁴ (see Sect. 3.2) and were used for the detrending of the light curve.