Hi Rene, In my macro I'm doing: inv_reb_signal_n->Add(inv_reb_real_n,inv_reb_mixed_norm_n,1.,-1.); inv_reb_signal_n->Print("all"); I checked the output for example bin #10: fSumw[10]=373.426, x=1.145, error=43.7226 But the error is wrong because: fSumw[10]=1911, x=1.145 (this is from 'inv_reb_real_n') fSumw[10]=1537.57, x=1.145 (this is from 'inv_reb_mixed_norm') 1911-1537.57=373.43, error=sqrt(1911+1537.57)=58.72 Am I doing something wrong? Thanks, Ilia ************************************************************************ * * * Ilia Ravinovich * * Department of Particle Physics PPE Division * * Weizmann Institute of Science Bld 892, 1D-015 * * Rehovot 76100 CERN, 1211 Geneva * * ISRAEL Switzerland * * * * PHONE : 972 8 9343187 41 22 7676437 * * FAX : 972 8 9466253 41 22 7677910 * * E-mail: Ilia.Ravinovich@weizmann.ac.il Ilia.Ravinovich@cern.ch * * * ************************************************************************
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