... The interferometer responses (visibility functions) on ground and ground­space baselines are analyzed. ... On the ground­space baselines, the visibility function contains a set of features superposed on each other and distributed within a certain interval of delays, which we identify with the scattering time for the interfering rays . ... Here, we analyze the shape of the amplitude of the visibility function for ground and ground­space VLBI baselines for sessions carried out from 2011 through 2013. ...