Introduction - If you have any usage issues, please Google them yourself
QUIVERS(x,y,u,v,Gscale,Spos,Sunit) plots velocity vectors a rrows with components (u,v)
at the points (x,y). The matrices X,Y,U,V must all be the same size
and contain corresponding position and velocity components (X and Y
can also be vectors to specify a uniform grid).