Hi, I’m having an issue when trying to read a single values of a branch in my TTree.

Here is a snippet of my root interpreter where a is my TTree :

```
a->GetEntry(1125103);
a->Show()
======> EVENT:1125103
batch_index = 18
iteration = 1195
iteration_weight = 2.19721e-07
```

I want to get the iteration_weight value for that event, proceeding as follow :

```
Double_t iteration_weight;
a->SetBranchAddress("iteration_weight",&iteration_weight);
a->GetEntry(1125103);
iteration_weight
```

the interpreter return the value “0.000” .

I don’t really know where is the error, did I badly defined ‘iteration_weight’ ? Though ‘iteration_weight’ is declare as a Branch of Double_t values when I look with a->Print().

I’ve tried some different options but I always get the outcome :

```
(double) 0.000000
```

How could I get the real value i.e. 2.19721e-07 ?

Thanks, sincerely,

Pierre.