Histogram not getting filled correctly from two separate root TTrees

So I’m using two separate root files to plot information from them on the same canvas using a macro.
The structure of both root files is same: both have a single (same) TTree and I’m trying to fill the histogram with the same branch that exists on the two root files.
However for some reason, I’m not able to fill all the entries from the branches into the histogram. I know this because when I plot the histograms in the interactive root session I get the correct plots. I have attached the code and the plots. Just to save you some time, this is how I am filling the two histograms:

Int_t nentries = (Int_t)t1->GetEntries();
    for (Int_t i=0;i<nentries;i++) {
        b_track_startX1->GetEntry(i);
        b_track_startY1->GetEntry(i);
        // fill the histogram with the destep entry
        h_track_start1->Fill(track_startX1,track_startY1);
        
    }
    
    
    Int_t mentries = (Int_t)t2->GetEntries();
    for (Int_t i=0;i<mentries;i++) {
        
        b_track_startX2->GetEntry(i);
        b_track_startY2->GetEntry(i);
        // fill the histogram with the destep entry
        
        h_track_start2->Fill(track_startX2,track_startY2);
    }

Any help is appreciated. Thanks !
readTTree.C (4.3 KB)

Post the output of:
t1->Print();
t2->Print();

This is the output of t1 and t2:

root [1] .x readTTree.C 
******************************************************************************
*Tree    :SCEtree   : SCEtree                                                *
*Entries :    15233 : Total =         5271749 bytes  File  Size =    3487550 *
*        :          : Tree compression factor =   1.49                       *
******************************************************************************
*Br    0 :event_eventNum : event_eventNum/D                                  *
*Entries :    15233 : Total  Size=     122718 bytes  File Size  =      22587 *
*Baskets :        4 : Basket Size=      32000 bytes  Compression=   5.41     *
*............................................................................*
*Br    1 :event_subrunNum : event_subrunNum/D                                *
*Entries :    15233 : Total  Size=     122726 bytes  File Size  =       4546 *
*Baskets :        4 : Basket Size=      32000 bytes  Compression=  26.88     *
*............................................................................*
*Br    2 :event_runNum : event_runNum/D                                      *
*Entries :    15233 : Total  Size=     122702 bytes  File Size  =       1161 *
*Baskets :        4 : Basket Size=      32000 bytes  Compression= 105.25     *
*............................................................................*
*Br    3 :matched   : matched/I                                              *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression= 117.02     *
*............................................................................*
*Br    4 :track_t0  : track_t0/D                                             *
*Entries :    15233 : Total  Size=     122670 bytes  File Size  =     117280 *
*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.04     *
*............................................................................*
*Br    5 :track_startX : track_startX/D                                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.05     *
*............................................................................*
*Br    6 :track_startY : track_startY/D                                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.75     *
*............................................................................*
*Br    7 :track_startZ : track_startZ/D                                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.75     *
*............................................................................*
*Br    8 :track_endX : track_endX/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.05     *
*............................................................................*
*Br    9 :track_endY : track_endY/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.73     *
*............................................................................*
*Br   10 :track_endZ : track_endZ/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.75     *
*............................................................................*
*Br   11 :track_MCS_measurement : track_MCS_measurement/D                    *
*Entries :    15233 : Total  Size=     122774 bytes  File Size  =      39850 *
*Baskets :        4 : Basket Size=      32000 bytes  Compression=   3.07     *
*............................................................................*
*Br   12 :track_length : track_length/D                                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.05     *
*............................................................................*
*Br   13 :track_theta : track_theta/D                                        *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
*Br   14 :track_phiU : track_phiU/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
*Br   15 :track_phiV : track_phiV/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
*Br   16 :track_phiY : track_phiY/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.05     *
*............................................................................*
*Br   17 :mctrack_t0 : mctrack_t0/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.04     *
*............................................................................*
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*............................................................................*
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.39     *
*............................................................................*
*Br   20 :mctrack_startZ : mctrack_startZ/D                                  *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.15     *
*............................................................................*
*Br   22 :mctrack_endY : mctrack_endY/D                                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
*Br   23 :mctrack_endZ : mctrack_endZ/D                                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.07     *
*............................................................................*
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*............................................................................*
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*............................................................................*
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.05     *
*............................................................................*
*Br   32 :mctrack_finalstep_py : mctrack_finalstep_py/D                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.06     *
*............................................................................*
*Br   33 :mctrack_finalstep_pz : mctrack_finalstep_pz/D                      *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.05     *
*............................................................................*
*Br   34 :anode     : anode/I                                                *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression=  10.91     *
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*Br   35 :cathode   : cathode/I                                              *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression=  10.56     *
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*Br   36 :enters_front : enters_front/I                                      *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression=  49.43     *
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*Br   37 :enters_back : enters_back/I                                        *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression=  44.08     *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression=   9.10     *
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*Baskets :        2 : Basket Size=      32000 bytes  Compression=  39.62     *
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*Br   41 :exits_bottom : exits_bottom/I                                      *
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******************************************************************************
*Tree    :SCEtree   : SCEtree                                                *
*Entries :    12638 : Total =         4347929 bytes  File  Size =    2890392 *
*        :          : Tree compression factor =   1.49                       *
******************************************************************************
*Br    0 :event_eventNum : event_eventNum/D                                  *
*Entries :    12638 : Total  Size=     101958 bytes  File Size  =      20377 *
*Baskets :        4 : Basket Size=      32000 bytes  Compression=   4.98     *
*............................................................................*
*Br    1 :event_subrunNum : event_subrunNum/D                                *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=  23.08     *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=  96.60     *
*............................................................................*
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*Br    9 :track_endY : track_endY/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.77     *
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*Br   10 :track_endZ : track_endZ/D                                          *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   1.74     *
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*Br   11 :track_MCS_measurement : track_MCS_measurement/D                    *
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*Baskets :        4 : Basket Size=      32000 bytes  Compression=   3.08     *
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    static Double_t track_startX1;
    static Double_t track_startY1;
    static Double_t track_startX2;
    static Double_t track_startY2;

BTW. Use … l2->Draw(); // no “SAME” here

Thanks. That was indeed a stupid mistake. I works perfectly now. And yes I now understand how I shouldn’t use the “SAME” for line2 as it is a property of canvas and not of histograms.

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