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[gembud] Strange double barbs form 11-30-12:00

Hi,
I attach a very strange chart produced with gdplot2. You will see double barbs at all points along 30W. This was apparent in both Mercator and Polar Stereo projections. It happened with the 301200 GRIB data from EGRR.
I have never seen it before or since. Pretty strange, eh? Is this a known bug? Could it have been in the data? 

Mark Hughes,

Global Weather Dynamics.

PNG image

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