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Hi All, I am using the rootfiles generated with IslBrecoilUser to study b->sgamma. I want to look at the variables cosTBB0 and cosTBChB which represent the cos of the angle between the thrust of the recoil B and the thrust of the reconstructed B, as the exclusive b->sgamma group have shown that this should differ for signal and background. These variables are in the ntuples generated, however I cannot find the code where they are calculated. Please can someone tell me how these variables are formed? Also, I have found that in the first few rootfiles only, of genbb, gencc and genuds, for example: /nfs/farm/babar/AWG8/ISL/sx-071802/genuds/output/outputdir/genuds-2000-old2000-2.root /nfs/farm/babar/AWG8/ISL/sx-071802/gencc/output/outputdir/gencc-2000-old2000-6.root /nfs/farm/babar/AWG8/ISL/sx-071802/gen_prod/B0/output/outputdir/genB0-2000-new2000-1.root either the cosTBB0 or cosTBChB is filled with zero. Can anyone explain this? Cheers Clare