Part of the field of view around DES J0408−5354  as seen with the 2.2 m MPIA/ESO telescope at La Silla observatory. The image is a stack of 150 frames totaling 25 h of exposure. The 6 PSF stars used to obtain the photometric light curves with deconvolution photometry are indicated in red. The 6 stars used for the frame-to-frame calibration of the relative photometry are indicated in green. The inset shows a 10′′ zoom on DES J0408−5354 and is extracted from a single 640 s exposure with 0.6′′ seeing with the same labelling for the quasar images as in Fig. 1 of Lin et al. (2017). Image C is blended with a foreground lensing galaxy labelled G2 in Agnello et al. (2017) and Lin et al. (2017).