Photometric measurements. The blue solid circles represent the photometry measured in the acquisition images, and the red empty circles represent the photometry measured from the polarimetric images. The green lines show the final value adopted for the time series (dotted green line represent an upper limit). In each panel, between parenthesis we report the ESO QC1 classification of the night (U = unknown, N = non stable, S = stable) followed by the sky conditions as we estimate after inspection of the LOSSAM plots available (c = clear, t = thin to thick). The LOSSAM archive is available online through the ESO website. This figure is discussed in Sect. 2.3.