plotting lat/lon positions on a contour map

  Hello all,

  What is the best/easiest way to plot the positions of
  arbitrary points on a contour map? Trying to overlay (with
  Ngl.overlay) a Ngl.xy plot on a Ngl.contour_map plot gives me:

  fatal:NhlAddOverlay: transform is already an annotation or overlay: 11

  And the points are not plotted. The error message indicates
  that I'm trying to overlay the xy plot onto a plot is already an
  overlay. Any ideas on how to do this?

  Thanks,

  - Ivan

-- 
Ivan Lima
Woods Hole Oceanographic Institution, MC&G MS #25
360 Woods Hole Road, Woods Hole, MA 02543-1543 USA
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