Draw() for CWN arrays

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after converting a CWN with one-dimensional arrays with h2root, I have
no idea how to plot the single fields of the array, e.g. my ntuple
block

#define NT_DETECTOR_JETS_FORMAT \
"Jets[0, 20]:I, " \
"JetPt(Jets):R, " \
"JetEta(Jets):R, " \
"JetPhi(Jets):R"

will be converted to a set of baskets. One of those is named
"JetPt".

Executing <TTree-name>.Draw("JetPt") plots the Pts of all jets. How
can I plot JetPt(1) without looping over the events and filling a
histogram by myself?

Tsch"uss, Thomas Kr"amerk"amper.

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