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      "switch_utc": "2023-09-27T22:00:00+00:00",
      "difference": 0.120000000000001
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    {
      "from_contract": "SIX23-COMEX",
      "to_contract": "SIZ23-COMEX",
      "decision_session": "2023-10-30",
      "old_volume": 96,
      "new_volume": 54337,
      "switch_utc": "2023-10-30T22:00:00+00:00",
      "difference": 0.11499999999999844
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    {
      "from_contract": "SIZ23-COMEX",
      "to_contract": "SIF24-COMEX",
      "decision_session": "2023-11-30",
      "old_volume": 422,
      "new_volume": 474,
      "switch_utc": "2023-11-30T23:00:00+00:00",
      "difference": 0.10999999999999943
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    {
      "from_contract": "SIF24-COMEX",
      "to_contract": "SIH24-COMEX",
      "decision_session": "2024-01-02",
      "old_volume": 9,
      "new_volume": 43472,
      "switch_utc": "2024-01-02T23:00:00+00:00",
      "difference": 0.21000000000000085
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    {
      "from_contract": "SIH24-COMEX",
      "to_contract": "SIJ24-COMEX",
      "decision_session": "2024-03-07",
      "old_volume": 87,
      "new_volume": 241,
      "switch_utc": "2024-03-07T23:00:00+00:00",
      "difference": 0.08000000000000185
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    {
      "from_contract": "SIJ24-COMEX",
      "to_contract": "SIK24-COMEX",
      "decision_session": "2024-03-25",
      "old_volume": 147,
      "new_volume": 36639,
      "switch_utc": "2024-03-25T22:00:00+00:00",
      "difference": 0.125
    },
    {
      "from_contract": "SIK24-COMEX",
      "to_contract": "SIM24-COMEX",
      "decision_session": "2024-05-13",
      "old_volume": 165,
      "new_volume": 406,
      "switch_utc": "2024-05-13T22:00:00+00:00",
      "difference": 0.08500000000000085
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    {
      "from_contract": "SIM24-COMEX",
      "to_contract": "SIN24-COMEX",
      "decision_session": "2024-05-27",
      "old_volume": 274,
      "new_volume": 41771,
      "switch_utc": "2024-05-27T22:00:00+00:00",
      "difference": 0.14999999999999858
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    {
      "from_contract": "SIN24-COMEX",
      "to_contract": "SIQ24-COMEX",
      "decision_session": "2024-07-18",
      "old_volume": 3,
      "new_volume": 307,
      "switch_utc": "2024-07-18T22:00:00+00:00",
      "difference": 0.060000000000002274
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    {
      "from_contract": "SIQ24-COMEX",
      "to_contract": "SIU24-COMEX",
      "decision_session": "2024-07-29",
      "old_volume": 397,
      "new_volume": 58941,
      "switch_utc": "2024-07-29T22:00:00+00:00",
      "difference": 0.16000000000000014
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    {
      "from_contract": "SIU24-COMEX",
      "to_contract": "SIV24-COMEX",
      "decision_session": "2024-09-06",
      "old_volume": 3,
      "new_volume": 548,
      "switch_utc": "2024-09-08T22:00:00+00:00",
      "difference": 0.13500000000000156
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    {
      "from_contract": "SIV24-COMEX",
      "to_contract": "SIX24-COMEX",
      "decision_session": "2024-10-18",
      "old_volume": 1,
      "new_volume": 378,
      "switch_utc": "2024-10-20T22:00:00+00:00",
      "difference": 0.04999999999999716
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    {
      "from_contract": "SIX24-COMEX",
      "to_contract": "SIZ24-COMEX",
      "decision_session": "2024-10-28",
      "old_volume": 47,
      "new_volume": 59135,
      "switch_utc": "2024-10-28T22:00:00+00:00",
      "difference": 0.1599999999999966
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    {
      "from_contract": "SIZ24-COMEX",
      "to_contract": "SIF25-COMEX",
      "decision_session": "2024-11-29",
      "old_volume": 167,
      "new_volume": 369,
      "switch_utc": "2024-12-01T23:00:00+00:00",
      "difference": 0.14000000000000057
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    {
      "from_contract": "SIF25-COMEX",
      "to_contract": "SIG25-COMEX",
      "decision_session": "2025-01-06",
      "old_volume": 127,
      "new_volume": 266,
      "switch_utc": "2025-01-06T23:00:00+00:00",
      "difference": 0.08500000000000085
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    {
      "from_contract": "SIG25-COMEX",
      "to_contract": "SIH25-COMEX",
      "decision_session": "2025-01-27",
      "old_volume": 79,
      "new_volume": 49559,
      "switch_utc": "2025-01-27T23:00:00+00:00",
      "difference": 0.129999999999999
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    {
      "from_contract": "SIH25-COMEX",
      "to_contract": "SIK25-COMEX",
      "decision_session": "2025-02-26",
      "old_volume": 19051,
      "new_volume": 30873,
      "switch_utc": "2025-02-26T23:00:00+00:00",
      "difference": 0.3149999999999977
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    {
      "from_contract": "SIK25-COMEX",
      "to_contract": "SIM25-COMEX",
      "decision_session": "2025-05-07",
      "old_volume": 17,
      "new_volume": 468,
      "switch_utc": "2025-05-07T22:00:00+00:00",
      "difference": 0.10499999999999687
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    {
      "from_contract": "SIM25-COMEX",
      "to_contract": "SIN25-COMEX",
      "decision_session": "2025-05-27",
      "old_volume": 267,
      "new_volume": 41747,
      "switch_utc": "2025-05-27T22:00:00+00:00",
      "difference": 0.14499999999999602
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    {
      "from_contract": "SIN25-COMEX",
      "to_contract": "SIQ25-COMEX",
      "decision_session": "2025-07-04",
      "old_volume": 2,
      "new_volume": 134,
      "switch_utc": "2025-07-06T22:00:00+00:00",
      "difference": 0.134999999999998
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    {
      "from_contract": "SIQ25-COMEX",
      "to_contract": "SIU25-COMEX",
      "decision_session": "2025-07-28",
      "old_volume": 396,
      "new_volume": 42680,
      "switch_utc": "2025-07-28T22:00:00+00:00",
      "difference": 0.17999999999999972
    },
    {
      "from_contract": "SIU25-COMEX",
      "to_contract": "SIV25-COMEX",
      "decision_session": "2025-09-23",
      "old_volume": 128,
      "new_volume": 376,
      "switch_utc": "2025-09-23T22:00:00+00:00",
      "difference": 0.00999999999999801
    },
    {
      "from_contract": "SIV25-COMEX",
      "to_contract": "SIX25-COMEX",
      "decision_session": "2025-09-29",
      "old_volume": 193,
      "new_volume": 506,
      "switch_utc": "2025-09-29T22:00:00+00:00",
      "difference": 0.23499999999999943
    },
    {
      "from_contract": "SIX25-COMEX",
      "to_contract": "SIZ25-COMEX",
      "decision_session": "2025-10-27",
      "old_volume": 105,
      "new_volume": 88437,
      "switch_utc": "2025-10-27T22:00:00+00:00",
      "difference": 0.17999999999999972
    },
    {
      "from_contract": "SIZ25-COMEX",
      "to_contract": "SIF26-COMEX",
      "decision_session": "2025-12-01",
      "old_volume": 227,
      "new_volume": 1350,
      "switch_utc": "2025-12-01T23:00:00+00:00",
      "difference": 0.2850000000000037
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    {
      "from_contract": "SIF26-COMEX",
      "to_contract": "SIG26-COMEX",
      "decision_session": "2026-01-02",
      "old_volume": 211,
      "new_volume": 807,
      "switch_utc": "2026-01-04T23:00:00+00:00",
      "difference": 0.18500000000000227
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    {
      "from_contract": "SIG26-COMEX",
      "to_contract": "SIH26-COMEX",
      "decision_session": "2026-01-26",
      "old_volume": 1119,
      "new_volume": 294421,
      "switch_utc": "2026-01-26T23:00:00+00:00",
      "difference": 0.38000000000000966
    },
    {
      "from_contract": "SIH26-COMEX",
      "to_contract": "SIJ26-COMEX",
      "decision_session": "2026-03-05",
      "old_volume": 137,
      "new_volume": 585,
      "switch_utc": "2026-03-05T23:00:00+00:00",
      "difference": 0.3049999999999926
    },
    {
      "from_contract": "SIJ26-COMEX",
      "to_contract": "SIK26-COMEX",
      "decision_session": "2026-03-30",
      "old_volume": 67,
      "new_volume": 25657,
      "switch_utc": "2026-03-30T22:00:00+00:00",
      "difference": 0.2600000000000051
    },
    {
      "from_contract": "SIK26-COMEX",
      "to_contract": "SIM26-COMEX",
      "decision_session": "2026-05-06",
      "old_volume": 123,
      "new_volume": 956,
      "switch_utc": "2026-05-06T22:00:00+00:00",
      "difference": 0.18500000000000227
    },
    {
      "from_contract": "SIM26-COMEX",
      "to_contract": "SIN26-COMEX",
      "decision_session": "2026-05-27",
      "old_volume": 224,
      "new_volume": 32659,
      "switch_utc": "2026-05-27T22:00:00+00:00",
      "difference": 0.269999999999996
    },
    {
      "from_contract": "SIN26-COMEX",
      "to_contract": "SIQ26-COMEX",
      "decision_session": "2026-06-30",
      "old_volume": 299,
      "new_volume": 421,
      "switch_utc": "2026-06-30T22:00:00+00:00",
      "difference": 0.28999999999999915
    },
    {
      "from_contract": "SIQ26-COMEX",
      "to_contract": "SIU26-COMEX",
      "decision_session": "2026-07-27",
      "old_volume": 127,
      "new_volume": 25213,
      "switch_utc": "2026-07-27T22:00:00+00:00",
      "difference": 0.19999999999999574
    },
    {
      "from_contract": "SIU26-COMEX",
      "to_contract": "SIV26-COMEX",
      "decision_session": "2026-09-02",
      "old_volume": 12,
      "new_volume": 249,
      "switch_utc": "2026-09-02T22:00:00+00:00",
      "difference": 0.21999999999999886
    },
    {
      "from_contract": "SIV26-COMEX",
      "to_contract": "SIX26-COMEX",
      "decision_session": "2026-10-06",
      "old_volume": 5,
      "new_volume": 182,
      "switch_utc": "2026-10-06T22:00:00+00:00",
      "difference": 0.2049999999999983
    },
    {
      "from_contract": "SIX26-COMEX",
      "to_contract": "SIZ26-COMEX",
      "decision_session": "2026-10-21",
      "old_volume": 33,
      "new_volume": 29545,
      "switch_utc": "2026-10-21T22:00:00+00:00",
      "difference": 0.21000000000000085
    }
  ]
}