hi, can any body of u tell me the meaning of '+', '-' and 'r' that appears at the beginning of trace when i run the satellite simulation.( here sat-aloha.tcl) + 2.6888 21 71 exp 230 ------- 0 21.0 71.0 0 0 -8.70 8.70 6.30 -6.30 - r thanks Ashish