[ferret_users] vectors on polar stereographic map projection

[xdz@xxxxxxxxxxxx (Xiangdong Zhang)]

Dear Ferreters,

I am plotting vectors on a polar stereographic projection map
by using the script mp_poly_vectors.jnl. The vectors get too 
dense in the polar area due to the grid cell convergence. I 
appreciate suggestions regarding controlling the density/number
arrows and the size of the arrow head. Thanks a lot in advance.

Regards, Xiangdong Zhang