Probability distribution for the size of the disc R_1/2, and for the power-law index ν of the temperature profile. Solid contours correspond to the constraints obtained after correction of the microlensing amplitude for the presence of an extended continuum, and the dashed contours show the constraints if we do not account for the extended continuum. Contours are 68.3, 95.5, and 99.7% confidence level. The corresponding peaks of the probability distribution are shown as a filled black star and red cross, respectively.