Hello, I am stripping off an ntuple with command like this: (ROOT 3.05/00) TTree *small = mmm.fChain->CopyTree("Et[0]>20&&Et[1]>20") By the way, the resulting file contains less events than I expected. I compared the entries and found that not all the events that pass the criteria are written to the target file. This seems to be happening whenever the event(entry = i) passes the cut and event(entry = i+x) also passes, and x is small number.. This is the list of variables in two files: ( j=164 and j=165 passes the cut, only j=164 survived. Out of j=175,177,178,179, j=175 and j=178 survived. Out of j=301,302, j=301 survived.) Original file: (showing the events that passes the cut) j 8 et1 101.701 et2 37.4808 j 10 et1 39.8504 et2 27.9597 j 28 et1 43.283 et2 37.779 j 84 et1 45.18 et2 27.6098 j 86 et1 40.8786 et2 20.0176 j 141 et1 37.3549 et2 22.055 j 158 et1 32.8841 et2 20.5765 j 164 et1 46.0031 et2 29.4996 j 165 et1 38.1034 et2 29.4996 j 175 et1 70.7513 et2 31.3695 j 177 et1 32.906 et2 31.3695 j 178 et1 32.8016 et2 24.8853 j 179 et1 22.3331 et2 24.8853 j 216 et1 151.5 et2 91.1525 j 246 et1 26.6626 et2 20.8906 j 257 et1 121.573 et2 72.1682 j 267 et1 36.5081 et2 23.0727 j 301 et1 40.4186 et2 36.0574 j 302 et1 29.8817 et2 36.0574 j 334 et1 59.1586 et2 37.6737 . . . Target file: (all the events in the target) j 0 et1 101.701 et2 37.4808 j 1 et1 39.8504 et2 27.9597 j 2 et1 43.283 et2 37.779 j 3 et1 45.18 et2 27.6098 j 4 et1 40.8786 et2 20.0176 j 5 et1 37.3549 et2 22.055 j 6 et1 32.8841 et2 20.5765 j 7 et1 46.0031 et2 29.4996 j 8 et1 70.7513 et2 31.3695 j 9 et1 32.8016 et2 24.8853 j 10 et1 151.5 et2 91.1525 j 11 et1 26.6626 et2 20.8906 j 12 et1 121.573 et2 72.1682 j 13 et1 36.5081 et2 23.0727 j 14 et1 40.4186 et2 36.0574 j 15 et1 59.1586 et2 37.6737 . . . Best, Jedong
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