[Rivet] custom reference for compare-histos

[Christian Rudolph]

Dear rivet-team,

  I am using a custom rivet analysis to evaluate generator-level theory 
systematics. For that, I have an 'official' HepMC file on which the 
analysis ran on and produced a 'nominal' .aida file. Now I want to 
generate events privately and use compare-histos to see the deviation 
from this 'nominal' histograms. How can I set this nominal .aida file to 
be used as reference for the ratio plots? I tried to use 
--refid=/path/to/my/nominal.aida, but it does not look right (see 
attached plot).

Many thanks in advance!
Cheers, Christian Rudolph

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