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In the best case, radiocarbon measurements allow artificial objects to be dated with a precision of 10 calendar years when conventional wiggle-matching onto the IntCal09 calibration curve is applied. More precise dating can only be achieved by using annually resolved 14C calibration data, particularly in timespans when there are rapid changes in atmospheric 14C concentration. The recently observed jump in atmospheric 14C concentration of 1.5% between AD 774 and 775, though expected to be rare,doi:10.2458/56.17634 fatcat:7yegwjlrfjhdjbheq6iwaspy24