[SAC-HELP] Help-sac pick

[Tsai cheng yung]

Dear all, 

Iwant to know the value between file zero time to event pick time,
what can I do?

thanks for your reading

SAC> apk
 L003EP 2 13103112 0 3.75
 L003EP 2 13103112 0 6.11
 L003EP 3 13103112 0 7.60
SAC> lh a
  
  
  FILE: L003.HHE.TW.-- - 1
 --------------------

     a = 3.750000e+00
  
  FILE: L003.HHN.TW.-- - 2
 --------------------

     a = 6.110000e+00
  
  FILE: L003.HHZ.TW.-- - 3
 --------------------

     a = 7.600000e+00
 		 	   		  
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