OEF angle
... 11,black triangle 0,11,4,-11,-9,-2.2,black triangle -15,-11,-9,-2.2,4,-11,black triangle 0,11,19,11,4,-11,black line -4,-7,-2,-5,red line -5,6,-3,4,red text black,-17,13,
medium,A ...
http://wims.unice.fr/wims/fr_H2~geometry~OEFangle.fr.html