Hi Rene, I need to make some branches that look a little like a column-wise ntuple. As a simple test, I added two arrays to a tree... see the example below. When I brows the leafs in root, they are identical. Both "epoch" and "mag" have identical values even though buff is 2*eps long and contains the epoch array followed by the mag array. // variable-length arrays: event->Branch("eps",&eps,"eps/I"); event->Branch("lightCurve",buff,"epoch[eps]/D:mag[eps]/D"); Can you send me an example of something like this that works? I would for example like to see the 2nd example in the user manual, "A Tree with a C Structure" that records all the structure elements in one branch. Thanks, Jodi Lamoureux
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