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linear fit 1250632800, 1257030000, 1283292000, 1330902000, 1362438000, 1383606000, 1387494000, 1395788400, 1435701600, 1451602800, 1480546800, 1493769600
linear fit 1250632800, 1257030000, 1283292000, 1330902000, 1362438000, 1383606000, 1387494000, 1395788400, 1435701600, 1451602800, 1480546800, 1493769600
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