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Fig. A.1


Spectral ratios. The numbers 1 and 2 denote the first and second spectroscopy epoch. The top and middle panels describe the ratios for the two sources that do not show evidence of variability between both epochs (G and A). The bottom panel describes the ratio between the two quasar images at the same emission time: B2/A1 (black) and B2/A2 (grey).

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