English: In reference to the mosaic view..., A. R. LUEDECKE, then Deputy Director, Jet Propulsion Laboratory, wrote, "The ridge of surface material pushed up during landing by the outward motion of the footpad, 12 inches in diameter, is well outlined by shadow, for the Sun was approximately 10° above the horizon when the pictures in the mosaic were taken. The contrast in texture and albedo between the undisturbed surface and that disturbed by the footpad is noticeable, particularly above the footpad. Both of these features indicate that the lunar surface material at the Surveyor I site is not hard rock but a structure disturbed appreciably when subjected to the rather low loads of the order of 5 pounds per square inch.