It seems sort of backwards, but to do this you will need to select the line graph. Create two Y-axis, one to sum "a" and the other to sum "b". Then click on "Metrics & Axes" and change both Chart Type's to bar.
Thanks for the nice idea. Unfortunately it's not what was asked from me The bars should contain the count of 100s and 0s of a-s and b-s. With your approach I get the sum of a-s and b-s which happen to be, in this case, similar to the count of 100s. But I'm missing the 0s.
It seems I would have to have the data in a different form than I have now in order to properly get the graphs required
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