WARNING, data item '_a' contains less values than data item '_b' even though they reside in the same loop -- 2 question mark symbols ('?') will be appended to the loop column '_a' instead of the missing values
WARNING, data item '_c' contains less values than data item '_b' even though they reside in the same loop -- 4 question mark symbols ('?') will be appended to the loop column '_c' instead of the missing values
WARNING, loop of data items '_d', '_e' does not contain any values -- a question mark symbol ('?') will be added as values for each data item
loop_
_a
_b
_c
1 1 2
4 2 ?
5 3 ?
? 4 ?
? 5 ?
loop_
_d
_e
? ?
