A way to adjust vertical axis scale on Data Explorer ?

Hi there,
I have a report in which I have 2 Custom events. One represents the number of time an ad is proposed to the player and the other represents the number of time an ad is accepted (yes, we are kind, we give the choice to the player, but we would like to know how many do accept to see an ad !).
Problem is the two events have two different scales on the preview. I'd like them to have the same scale, as you can imagine. The curves would be more significant. I'm linkin an image so you can see one has 2 times the scale of the other.
Is there any way to solve this ?