Re: ppl aline with a time axis

[Billy Kessler <kessler@xxxxxxxxxxxxx>]

Hello Arindam -

This is always a bit tricky. What you need to do is 
make your plot, then find out the time axis limits:

yes? PPL LIST TAXIS

The output will be something like:

yes? PPL LIST TAXIS
        TAXIS QUALITIES
         LO= 8.73E+03 DT= 6.00E+01 CSIZE= 1.00E-01 TYPE= TAXIS3 VANG= 0.00E+00
          TOP AXIS= ON  BOTTOM AXIS= ON 
           TMIN=19910801000000  0:00 AUG  1,1991    
           TMAX=20010101000000  0:00 JAN  1,2001    
         TSTART=19900802071254  7:12 AUG  2,1990    
         NMTC= -1 LABEL= -3 IFDB=  3 ISDB=  1 TAXIS= XAXIS IAUTOT= ON 

Note the value of TSTART, which is typically one year before the
start of the data. Then define the time values (x-values) of your
line relative to TSTART, in hours:

yes? PPL ALINE,2,`365*24*2`,-1,`365*24*4`,-1

which will draw a line at y-value=-1, extending from 2 years after
TSTART to 4 years after TSTART.

Billy K