Stereoscopic movie generated from Bern SPH simulations, approximately 178 seconds post-impact. These stereoscopic pairs can be viewed in 'parallel' stereo mode simply by relaxing the eye convergence. We suggest viewing the pair of images from 30 cm or so away, and look through the screen to infinity, allowing the two images to float across each other. Where the two central pictures exactly overlap, the`fused' 3-D image is to be found; all that is then necessary is to gently adjust the focus of the eyes, while the convergence remains relaxed, to obtain a clear stereoscopic image. This technique is called `Free Viewing' of stereo pairs. For a more authentic stereo effect, use a Brewster format stereoscope - The London Stereoscopic Company OWL or similar. Detailed instructions may be found at LondonStereo.com