Light curve of the integral flux between 0.6 TeV and 10 TeV in a 0.1° region centered on position A binned such that each point represents the data in one H.E.S.S observing run (typically 28 min). An upper limit for 99% confidence level is shown with an arrow when the fluctuation in the integral flux is negative (grey points). The dashed horizontal line shows the mean integral flux.