shifting of grids in wmlabs func

Dear all,

I have a script that plots river directions in a basin. When I try to
plot the river directions in terms of raster mode, it exactly overlaps
with map. However, when I try to plot the river directions in terms of
vector symbols with corresponding directions by using the "wmlabs"
function, there is a strange shifting in river direction grids over
the map. The plots and script are attached. Could anyone help me fix
that problem?

Thanks in advance,

deniz

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• text/plain attachment: rivdir_grid_direction.ncl