Posterior distribution of the exponential model fitting the coma on 21 August 2014 R-band observations. The red area indicates the 68% confidence limits, and the yellow square in the center is a maximum likelihood point corresponding to a coma contribution of 85% to the overall brightness and the FWHM of the coma profile at about the 240 km distance. The result is in some sense degenerated: the brighter coma implies more compact distribution, while the fainter coma is connected with its larger spatial size.