“…Only a 6° grid was used in many investi gations so far [4-7, 11,12, 14, 16, 17, 19, 20], Recently, however, there are increasing rec ommendations that both programs should be combined in order to obtain the closer 42° grid [8,13,18]. However, the precise reper cussions of this measure have not been inves tigated scientifically so far.…”