Scale X-axis on RooFit

Hi,

I have a problem because I plotted an histogram+fit on a frame on RooFit, but the units on the x-axis are ADC count. I would to convert these in eV and I have a parameter to do this (if I use adc*parameter I obtain eV), but I’m not able to do this.
I found and red some similar topic but anyone was helpful to me.

Thanks

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