AlgebraOfGraphics visual(Lines): how can I keep AoG from joining up lines corresponding to different parameter values?

[karlroyen]

You can add NaN to the end of the data for each line:

dfs = [DataFrame(x = [1:10; Inf], y = [α*(1:10).^2; NaN], parameter = α) for α = 1.0:0.1:1.5]