[Rivet] How to initialize AxesDefinition?

[Debarati Roy]

Hi Experts,
                 Could you please point me to some example or let me know how one can initialize the AxesDefinition in the .cc ? I tried with this(inside the init() method with Rivet 2.2x version),
.....................................................................................................................
const FinalState fs(-2.6, 2.6, 0.0*GeV);
      addProjection(FastJets(fs, FastJets::ANTIKT, 0.5), "Jets");

      const AxesDefinition& ax(fs);
      addProjection(ax, "Axes");
.......................................................................................................................
But I am getting the following error,
.......................................................................................................................
error: invalid initialization of reference of type ‘const Rivet::AxesDefinition&’ from expression of type ‘const Rivet::FinalState’
.........................................................................................................................
 This is needed to use new Hemispeheres calc methid in the following way(inside analyze method),
.......................................................................................................................
Hemispheres hemi(ax);
      hemi.calc(n,jets);
      if (debug == true)
    {
      const double B = hemi.Bsum();
    }
.....................................................................................................................

Thanks,
Debarati


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