(
    size: 2,
    cell: (
        matrix: [10,0,0,-0.0000004371139,10,0,-0.0000004371139,-0.00000043711393,10],
        inv_matrix: [0.1,0,0,0.000000004371139,0.1,0,0.000000004371139,0.0000000043711395,0.1],
    ),
    elements: [
        F,
        F,
    ],
    molecules: [
        0,
        0,
    ],
    positions: [
        [0,0,0],
        [1.3,0,0],
    ],
    velocities: [
        [-0.007225223,-0.0024057564,0.0026065109],
        [0.001179634,0.0035252622,-0.00041327748],
    ],
    masses: [
        18.998,
        18.998,
    ],
    charges: [
        0,
        0,
    ],
    bonds: [],
    angles: [],
    dihedrals: [],
)