I recorded a couple of small events the other day, a 2.9 followed 
shortly by a 2.7, at a distance of around 200 miles.  I noticed that 
when I turn on the P and S phase marker lines in Winquake, they don't 
line up with the P and S phase markers (ie. the veritical arrows).  The 
amount of discrepancy depends on which table I select, and isn't all 
that great unless I really zoom in tight.

So, two questions.  Why the difference?  And which should I use to 
estimate the distance to the event, the arrows or the phase lines?  (Not 
that it really makes much difference, since I usually have a lot of 
uncertainty where the phase onsets are anyway.)

Larry Conklin
Liverpool, NY
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