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This isn't currently possible except by splitting a line into two segments and adding an arrowhead to the end of one of them. That's fairly simple with straight lines, but with curved lines it may be necessary to add extra vertices to your line to make the curve look continuous. I've attached an example - hopefully you can figure out what I did by examining the file
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Name:	Arrowhead line.png
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File Type: zip Arrowhead line.ograph.zip (14.1 KB, 381 views)