R pass band magnitudes of validated (red points) and suspected (green stars) LIFs, observed since February, 2017, against the lunar phase. Horizontal dashed lines indicate the empirically set detection limits of NELIOTA in the R filter according to the lunar phase (see text for details). Vertical short-dashed lines denote the range of the lunar phases during which NELIOTA was operating. For convenience, the respective illumination phases are also indicated (orange).