Graph using 2 x-axis and 1 y-axis

Hi All,

How do you create a graph using Excel 2007 that represents 2 x-axis and 1 y-axis. For example, I'd like the data in Column A and Column B to form two plots on the x-axis and the data in Column C to form a plot on the y-axis. Please see attached and thanks again in advance.

-Mario