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Fig. 1

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Upper panel: differential light curve of the proposed blazar optical counterpart to J0109+6134/GT0106+613 in the i-band Sloan filter as a function of modified Julian day (MJD). The photometric points were obtained from the average of the different comparison stars. Error bars not shown are smaller than the symbol size. Middle panel: Fermi LAT light curve of J0109+6134 for energies above 200 MeV based on an unbinned likelihood analysis with the Fermi science tools. Lower panel: photometric behaviour of comparison stars as a function of time. An arbitrary offset has been added to each of them for easier display. The dashed lines indicate the average of the differences of magnitude.

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