Fig. 2
Top: variability of colour indices V − R, V − I and R − I of V404 Cygni in outburst as observed with the UJT on 26 June 2015. They are shown plotted in black, red, and magenta colours, respectively. Bottom: the same kind of plot for the four comparison stars plotted at the same scale. Their colours remained constant within 0.02–0.03 mag.
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