Radial intensity profile of the aureole (blue crosses) as a function of the number of HMI pixels along the radial direction from the center of Venus. The profile has been measured from one SDO/HMI frame, collected on June 5th, 2012 at 22:21:55, for the latitude +49°. The blue dots represent the bilinear interpolation performed on the radial profile at steps of 1/10 of one pixel. The vertical axis is the signal intensity in ADU. The green curve is the result of a Gaussian fit with a linear slope. The width at half-height is 1.875 arcsec and corresponds to 390 km at Venus.