Z (Drell-Yan) : Underlying event : <Nch> vs p_T^Z

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pythia8~8.201--1sherpa~2.2.4Array
(
    [0] => pythia8
    [1] => 8.201--1sherpa
    [2] => 2.2.4
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Array
(
    [0] => Array
        (
            [0] => pythia8
            [1] => 8.201--1sherpa
        )

    [1] => Array
        (
            [0] => 2.2.4
        )

)
Array
(
    [pythia8] => Array
        (
            [0] => 8.201--1sherpa
        )

    [2.2.4] => Array
        (
            [0] => 
        )

)

pp @ 13000 GeV