# pstopng:   
# using pstoimg from latex2html
# and netpbm 9.12

/usr/local/bin/pstoimg -type png -crop abls -white -out _tmp_x.png $1.ps 
pngtopnm _tmp_x.png > _tmp_x.pnm
pnmrotate -90 _tmp_x.pnm  > _tmp_y.pnm
pnmtopng _tmp_y.pnm > $1.png
rm _tmp_*


pstopng  plot_arrows
