[Rivet] 2d Histogram

[Hendrik Hoeth]

Thus spake James Henderson (James.Henderson at physics.ox.ac.uk):

> I've been trying to fill a 2d histogram in my rivet analysis but every
> time I try to make the plots from my aida file, I get a 'math domain
> error' from the 2d histo.
> Could you point me to a resource on 2d histos for rivet or tell me if
> there is something different in the 2d case from the 1d histos. Is
> there anything special I need to include in my .plot file?

Set LogY=0.

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