"Any line can be a remark like this
"Platf =0 to 4, others are nos. or text
"Preferred names for start points are N,S,E,W,1,2,3,4,NE,SE,SW,NW
"Option...write PROBE for Platf
"Please limit fields to 10 characters
"Descriptor is the preferred field for subject-group
"Format is Start,Platf,Subject,Descriptor
N,1,rat1,groupA
S,probe,rat2,groupB
E,3,rat3,groupA
W,4,rat4,groupB