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.Th                                    PLOTPK
.S2 SUMMARY:
Interactively work with traces 

.S2 PlotPK  [options]
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The options are
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Perplot [n | off]  : Plot n traces per frame or plot all on one frame (off)
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MARKALL            : Change headers for all traces within the plot frame. This is convenient for assigning the same P\-pick time to all 3\-components recorded at a station
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MARKALLOFF         : Turn off Markall \- this is because we do not require a MARKALL ON
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Relative           : Plot traces according to time from the first sample
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Absolute           : Plot all traces in absolute time
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REGional           : Put up a simple regional phase menu
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Teleseism          : Put up a simple teleseism phase menu
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Quality            : Put up a simple quality control  menu
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PQuality           : Put up a simple quality control  menu and repick P
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Default            : Do not put up a phase menu, turn off marking
.S2 DESCRIPTION:
The cursor responds to the following commands:
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.nf
-	: compress time scale by factor of 2, recenter trace 
_	: compress time scale by factor of 2, recenter trace
+	: expand time scale by factor of 2, recenter trace
=	: expand time scale by factor of 2, recenter trace
(space) : recenter trace
*	: increase trace amplitude by factor of 2
m	: increase trace amplitude by factor of 2
/	: decrease trace amplitude by factor of 2
A	: accept (put +1 in IHDR20 for trace)
R	: reject (put  0 in IHDR20 for trace)
B	: move to the previous page of traces
F       : insert a FINI marker (end of useful signal)
L	: give time and amplitude of point beneath cursor
N	: move to next set of traces
O 	: return to original trace scaling
P	: mark P time
S	: mark S time
Q	: end interactive trace picking
Tn	: set Tn header where n is a value from 0-9
	  Note that S sets T0. (Just enter T and then an integer)
X	: Define trace window by entering X two times
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If the REGIONAL or TELESEISM are flagged, a small phase menu appears:
P S Pg Lg for regional phases and P S and PKP for teleseismic phases.
To use these menus, choose the phase from the menu, then select the
time value from the trace, and classify the quality of the arrival. If the P phase is selected, then the first motion polarity must be indicated.
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The Quality menu permits the use of the 'a' and 'r' keys to mark a trace for further use. In addition, the default action of any mouse press is to indicate accept, unless the Reject Menu button is pressed. Normally IHDR20 is set to -12345. An accept sets this to +1 and a reject to -1. If a WriteHeader is executed, then the trace headers are set to the new values, and a shell script can then select traces for further processing. The purpose this command is to use gsac graphics
to speedily judge trace quality for other processing.
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The Pquality menu works slightly differently from the Quality menu in that the objective is to select good traces and also to repick the P arrival. Just place the crosshair on the P arrival, click any mouse button and the P is repicked and  the trace is selected (IHDR20 is set to 1) with one click.
.S2 NOTE:
On July 10, 2010 the interactive cursor will respond to the ~ (tilde) character by creating a screen dump with name DUMPxxx.PLT. This dump includes the menu and is introduced to assist documentation.

.S2 "SEE ALSO":
PLOT1

