# Look up trace header values from tables

# ... assume that tables geometry-offs-1, geometry-offs-3, etc. exist
# and contain entry m-lat (midpoint latitiude) keyed by the value of 'soffset'. 
# Then, we retrieve these values in trace headers like this:

*call	hdrmath	
olookup	m-lat	float	m-lat	geometry-offs*
soffset	soffset