Dear Therionners, This is a sample of my centerline data: data diving station depth length bearing GTENC0001 36.3 0.45 257.6 GTENC0002 36.2 0.26 248.6 GTENC0003 36.2 0.52 233.3 Simple and straightforward as this may seem, Therion just spits it back into my face saying: -- non-interleaved data before newline -- length The following works (this is the format I use when processing a limited amount of survey data), but obviously this sucks balls when processing large amounts of data (I have 1000 lines of computer generated survey data in this centerline) data diving station depth left right up down ignore newline \ length bearing ignoreall GdB09 30.0 - - 2.7 0 [T, White arrow #4] 10 204 GdB08 30.6 3 0 2 0.5 [T, White arrow #3] 17 265 It seems I'm too stupid to understand why there needs to be a newline before length. Can anyone tell me what I'm not understanding / what I'm doing wrong / how to work around this apparently useless newline requirement? Cheers, Anton