[Rivet] plotting two different ratios on same plot

[Raghav Kunnawalkam Elayavalli]

Hi Rivet experts, 

I have 4 different spectra say A, B, C and D. I want to plot the individual spectra, and in the ratio plot i want to plot A/B and C/D. is there a simple way to do this? I tried putting the ReferenceHistogram inside the BEGIN HISTO1D but that didnt work. 

Cheers
Raghav