Topic:
Horizon posts in one color.

Description:
Spectrum display is correctly set to Horizon.  The spectrum range is
substantially greater than the expected horizon time range.

A corrupted pick is extending the spectrum range to such an extent that real
data all falls within the range of one color on the spectrum. Zooming in and
panning over the basemap may not yield the corrupted pick.

Solution:
There are several workarounds to fix this problem:

1) Export the horizon to an ASCII file and locate the spike using the following
   awk script.
   {
   if ($5 > 10000)
   print $0
   }

   This script assumes the time pick is in column 5.
   The output will yield the corrupted pick(s).  Either remove these picks from
   the data file and import the edited horizon or use the linenames and cdp
   numbers identified to locate the problem picks and re-pick them.

2) In Post Interpretation, set the data to post to range only, set spectrum
   range mode to user input. Input min/max of data out of range, not the range
   of the real data and display. Might have to zoom up to view point(s) out of
   range. Delete with Mode > Horizon Erase.

3) Read horizon in MapView, go to Edit data points > Histogram and delete
   bad point. Save xyz file, select xyz file and save back as new horizon in
   XYZ Operations. 



Last Modified on: 17-MAR-99