Fit between modelled and picked traveltimes after 41 WET iterations : 

RMS error : 3.17 millisecs.
Normalized RMS error : 13.30 percent (RMS error, divided by average pick time of all traces modelled)

Improve your first break picks obeying reciprocity principle to reach normalized RMS error below 5 percent. See

http://rayfract.com/tutorials/riveral8.pdf and
http://rayfract.com/tutorials/GEOEXP13.pdf and
http://rayfract.com/tutorials/Slope1.pdf

Relative misfit function : 10.03 millisecs. (Gerard T. Schuster 1993 p. 1315; squared error summed over all traces modelled,  divided by the modelled trace count)
Maximum absolute error : 6.97 millisecs., for trace 004-003 (Shot#-Trace#) in database C:\Ray402\line14\SEIS32

# of traces modelled : 120

Use overlapping receiver spreads with profile-internal far-offset shots for deeper and more reliable imaging. See 

http://rayfract.com/help/overlap.pdf .