### example 4 vertical grouped bar
d1 <- dPlot(
  x = c("PriceTier","Channel"),
  y = "UnitSales",
  groups = "Channel",
  data = data,
  type = "bar"
)
d1$legend(
  x = 60,
  y = 10,
  width = 700,
  height = 20,
  horizontalAlign = "right"
)
d1