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Time-of-day (UT)/time-of-year (F) plots of: (left-hand column) the sensitivity of the am index, Sam, for 1988 (the mid-point of the interval 1959–2017 for which am data are available); (middle column) observed 〈ap〉/〈am〉 and (right column) Sap = (〈ap〉/〈am〉)Sam. Data are for 1959–2017 (inclusive) and the am ranges defined in Figure 6.
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