Elastic : Cross sections

pythia6~6.423--1pythia8~8.180Array
(
    [0] => pythia6
    [1] => 6.423--1pythia8
    [2] => 8.180
)
Array
(
    [0] => Array
        (
            [0] => pythia6
            [1] => 6.423--1pythia8
        )

    [1] => Array
        (
            [0] => 8.180
        )

)
Array
(
    [pythia6] => Array
        (
            [0] => 6.423--1pythia8
        )

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

)

pp @ 7000 GeV