[Rivet] Merging of nparton samples

[Chris Pollard]

Hi Dominic,

Yes and no. I need to weight the different histograms during the merging.
> What I have are for example 5 samples:
> tt+0p   9.97 pb
> tt+1p  10.83 pb
> tt+2p   7.72 pb
> tt+3p   3.95 pb
> tt+4+p  2.58 pb
> Now these 5 subsampels need to be merged to one common sample, with
> their given xs.
>

Right, but if you normalize each histogram to the appropriate xs in
finalize(), this shouldn't be a problem. Is this not what you're doing?

Chris
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