Stacking
Line, smoothed line, column and step line graphs can be stacked. As area chart is just a simple line chart filled with color, you can have stacked or 100% stacked area charts. The chart on the right is rotated 100% stacked step chart. As you see, it would be quite difficult to count how many different chart types you can implemented with Cartesian chart flex component.
Advanced legend
As you noticed, the two legends are quite different. One uses round markers, and another - square. Legend component can also show triangle, line or dashed line markers. The legend on the left uses "v" type of switch - this means that visible graphs will be checked. Right legend uses "x" type of switch, this means the invisible graphs will have x above the legend marker (try clicking on markers to see this in action). Another great feature: if you roll-over the text entry in the legend, the graph representing this entry will be highlighted by reducing opacity of other graphs.