  Blue curve = 30T_0p58_HG.dat ... (x = column 1, y = down adjusted      = column 6)
 Olive curve = 40T_4p01_HG.dat ... (x = column 1, y = down               = column 5)
Purple curve = 30T_5p00_HG.dat ... (x = column 1, y = down offset adjust = column 6)
 Black curve = 30T_9p99_HG.dat ... (x = column 1, y = down offset        = column 6)
