col	name	explanation

1	stat	station number (B array)
2	range-s	range from south shot
3	ttv-s	vertical traveltimes thru upper 5 km of final N/S model
4	range-e	range from east shot
5	t21	traveltime of station 21 (east shot)
6	Dtt-e	traveltime amomaly with respect to station 21 (east shot)
7	tt-e	traveltime of east shot
8	Dx-e	difference in range (east shot) between this station and station 21
9	az-e	azimuth with respect to east shot
10	Dtt-ec1	east traveltime normalized to range of station 21 col(10)=col(6)-col(8)/6.8
11	Dttv-s	verticl traveltime anomaly col(3)-mean
12	Dtt-ec2	east traveltime corrected for vertcal traveltime anomay col(12)=col(10-col(11)