Daily binned light curve of the integral VHE-ray emission (red points) from 1ES 1011+496 above 150 GeV during observations carried out from 2011 to 2012. Upper limits (gray arrows) at 95% confidence level were derived according to the Rolke et al. (2005) method for each time bin where the observed integral flux was negative or with a flux estimation smaller than its error (red points with dashed error bars). The mean flux level (black dashed line) is retrieved from a fit with a constant to the light curve including the points that are negative or whose relative error is greater than 100%.