The smallest scale topographic map of the Iani Chaos region on Mars. The scale is just 1:50 000. The contour lines are now only 50 meters apart. At these smaller scales, more textural details of the surface can be recognised. The data were obtained by the High Resolution Stereo camera on board ESA's Mars Express on 5, 8 and 11 October 2004 (during orbits 0912, 0923 and 0934 of Mars Express).