Clarify unit in Transaction Size diagram

[murchandamus]

I noticed that the unit in the "Transaction Size" diagram is unclear. The title implies that we are looking at size, but the values make me rather think it’s vsize. Could you please mention the unit in the chart description?

Perhaps you could even show both the size and the vsize. I imagine that it would be interesting to see how the two had shifted respectively in the last year. If so, would it perhaps be possible to add controls that allow the viewer to show and hide subsets of the four lines?