Due to characteristics of the GW019A observations & correlation tactics,
the normal standard plots weren't optimal for summarizing the experiment.
We therefore made a different set of plots manually, as described below.
These are in general more exhaustive that the usual standard plots, but
also somewhat more complicated owing to the 3 different "portions" of
correlation.  For specific data-quality comments, see the (rather lengthy)
GW019A cover letter.


All plots discussed here were made while the data were still in aips++
Measurement Sets prior to conversion to FITS files.  The station
numbering is 0-based in the aips++ plots, but 1-based in the FITS data
(1-based numbering used below).

The names of the plot files on the archive are:

  gw019a.{pass}-weight.ps.gz              station weight vs. time 
  gw019a.{pass}-auto-[1,2].ps.gz          station autocorrelation real vs. freq
  gw019a.{pass}-cross-[1,2][a,p].ps.gz    baseline amp/phs vs. freq
  gw019a.{pass}-ampphase-[a,p].ps.gz      baseline amp/phs vs. time

where {pass} = "EVN", "3PASS", or "VLBA" (corresponding to the portion
of the experiment).
The weight and ampphase plots show the whole experiment.  
The auto & cross plots show all baselines for 1 minute of data taken near 
from scans:
               [1]              [2]
    EVN      scn  37 (DA193)  scn  80 (DA193)
    3PASS    scn  94 (3C84)   scn 164 (0528+134)
    VLBA     scn 173 (DA193)  scn 215 (DA193)

The reference station(s) and IFs plotted for the ampphase plots are:
    EVN       Ef-*           IF 1-8 (parallel-hand pols)
    3PASS     Ef-* & Yy-*    IF 4-5 (   "       "   "  )
    VLBA      Yy-*           IF 4-5 (   "       "   "  )
Reference stations were used to keep the plot files to reasonable sizes,
and only IFs 4-5 were used for plots including VLBA stations to show IFs
where Yy had power, and to avoid IFs affected by the strange VLBA weights.



(a) WEIGHT plots

  The weight plots combine the parallel-hand pols for all IFs per station,
with each 1s integration plotted as a separate ".".  The IF/pol color-coding
is:
 IF1/RR = red    IF1/LL = blue      IF2/RR = cyan        IF2/LL = green
 IF3/RR = pink   IF3/LL = med.grey  IF4/RR = brown       IF4/LL = purple
 IF5/RR = teal   IF5/LL = yellow    IF6/RR = steel blue  IF6/LL = lt.grey
 IF7/RR = black  IF7/LL = orange    IF8/RR = lt.green    IF8/LL = lt.purple


(b) AUTOCORRELATION SPECTRA plots

  The autocorrelation plots show 1min of data from the scans listed above.
Each IF is plotted separately, and the y-axis ranges don't necessarily
go down to zero.  Within each IF, the parallel-hand polarizations are
plotted:  red=RCP, blue=LCP.  The plots show the real component rather than 
amplitude to avoid aliasing negative values.  A weight cut-offs of -0.01 was 
used to allow showing the higher IFs for the VLBA stations.


(c) BASELINE SPECTRA plots 

  The cross plots show amplitude and phase for all baselines for the same
1-minute intervals from the standard auto-plots.  Amp(frq) and phs(frq)
go into separate plots (the [a,p] character in the filename) with 
corresponding baseline lay-out.  Here, all IFs for a baseline share the
same plot, separated by the dotted vertical lines.  Polarization color-coding
within each IF is:
   red = RR    blue = LL    cyan = RL    green = LR
with the phase plots showing only the parallel-hand polarizations.


(d) AMP/PHASE(t) plots 

  The ampphase plots show amplitude & phase for Ef-* and/or Yy-* as a 
function of time for the whole experiment.   The IF/polarization color-coding
for the EVN portion is the same as for the weight plots; for the other ones
it is:
 IF4/RR = red   IF4/LL = blue     IF5/RR = cyan    IF5/LL = green  
Each 1s integration is plotted as a separate ".", with the middle 80%
of the band used for vector-averaging in frequency.