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[ferret_users] mp_graticule - line color



I am trying to plot white graticule lines on an orthographic map.  The background color is dark blue due to my choice of palette (I’m plotting sea ice). Does anyone know how to specify white graticule lines?  I tried all numbers 1-18 in the pen argument for mp_graticule but none yield white lines.  

Thank you,

Randye

Dr. Randye Rutberg
Assistant Professor
The Department of Geography
Hunter College of the City University of New York
695 Park Ave
New York, NY 10065

email:rrutberg@xxxxxxxxxxxxxxx
phone: 212 772 5326





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