[ferret_users] strange arrows for wind direction

[CARLOS ROMÁN CASCÓN <carlosromancascon@xxxxxxxxxx>]

Hi all,

why do I obtain this kind of arrow when plotting wind direction from "u" and "v" components?
why I can't see a "normal" arrow?

This is what I use:
 
set region /l=750/j=30:70/i=60/
vector /vlim=400:7000 u,v,xlat,geopotential_f;

Thanks in advance

Regards

Carlos

-- 
Carlos Román Cascón
Departamento de Geofísica y Meteorología
Facultad de Ciencias Físicas
Universidad Complutense de Madrid
Madrid, Spain. 

Attachment: wind_dir.gif
Description: GIF image