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plot the observed travel time picks from the file tx.in
(1 or -1), or plot only those picks used in the inversion if invr=1
(2 or -2); the observed data are represented by vertical bars with
a height of twice the corresponding uncertainty specified in the
file tx.in if idata>0, or by symbols of height symht if idata<0
(default: 0)

*Ingo Pecher *

Sat Mar 7 19:13:54 EST 1998