Hi Just been entering (well making up) some interleaved diving data, and for a few of the stations I would like to put a comment for the reading so I tried data diving station count depth ignoreall newline compass ignoreall calibrate depth 0 -1 #makes depths positive; 3 is deeper than 2 0 0 0 180 Taken from splay into sump in Skeleton.th 1 8 3 Depth read by AA on previous dive 100 2 11 1 80 3 14 1 140 Taken from reverse of splay of 319 into sump in Skeleton2.th 4 25 0 Line belay It appears that I cannot have an ignoreall before the newline, as it complains that not all data for given style removing the ignoreall before the newline and adding as comment works, eg data diving station count depth newline compass ignoreall calibrate depth 0 -1 #makes depths positive 3 is deeper than 2 0 0 0 180 Taken from splay into sump in Skeleton.th 1 8 3 #Depth read by AA on previous dive 100 2 11 1 80 3 14 1 140 Taken from reverse of splay of 319 into sump in Skeleton2.th 4 25 0 #Line belay Testing the first data entry in Survex works, so it looks like it is a bug in Therion implementation of interleaved data, if my interpretation is correct thanks Andrew