ggplot(test, aes(x = X1, y = X2)) +
      geom_segment(
        aes(x = 0, y = 0.8, xend = 0.27, yend = 1.2, colour = "green", size = 2), data = test)

ggplot(test, aes(x = X1, y = X2)) +
      geom_segment(
        aes(x = 0, y = 0.8, xend = 0.27, yend = 1.2, colour = "blue", size = 1), data = test)