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Helper function to draw text with a shadow/background
shadowtext( x, y, labels, col = "black", bg = "white", pos = NULL, offset = 0.5, cex = 1, ... )shadowtext( x, y, labels, col = "black", bg = "white", pos = NULL, offset = 0.5, cex = 1, ... )
shadowtext( x, y, labels, col = "black", bg = "white", pos = NULL, offset = 0.5, cex = 1, ... )