Example of the methodology used to identify the boulders on the surface of 103P. A) Subframe of a HRI-V image (HV10110413-5004015-001) taken on 4 November 2010 at a distance of 1416.4 km from the surface of 103P. The scale of the image is 2.83 m/px. The white arrows indicate the direction of the solar irradiation. In this figure, the shadows of the boulders are observable on the left of such positive reliefs. B) The same image with the detected boulders indicated in yellow circles are presented. C) Subframe of a HRI-V image (HV10110414-5006002-001) taken on 4 November 2010 at a distance of 1407.2 km from the surface of 103P. The scale of the image is 2.81 m/px. The white arrows indicate the direction of the solar irradiation. As from the above image, the shadows of the boulders are observable on the left of the positive reliefs. D) The same image with the detected boulders indicated in yellow circles.