Just learning the fportfolio package and wondering how I add labels for
each of the assets in a frontierPlot. singleAssetPoints adds the points on
the graph but I'd like to add the asset names to the points so I know which
asset is which.

require(fportfolio)
front <-portfolioFrontier(SMALLCAP.RET)
frontierPlot(front)
tangencyPoints(front,col='red', pch=19)
tangencyLines(front, col='blue')
singleAssetPoints(front,pch = 19, cex = 1.5, col = topo.colors(6))

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