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Comparison of the new homogenised indices aa H, aa HN and aa HS, with the IHV index and the δ-corrected a NGK, a SOD and a ESK values. The left-hand plots show the time series and their respective best-fit linear regressions. The right-hand plots show scatter plots of the new indices against the test indices (a NGK/s(δ), a SOD/s(δ) or IHV) and the least-squares best-fit linear regression line. The linear correlation coefficient r is given in each case. Parts (a) and (b) are for aa HN and IHV; parts (c) and (d) are for aa HS and IHV; parts (e) and (f) are for aa HS and IHV; parts (g) and (h) are for aa H and the corrected a K values from Niemegk, a NGK/s(δ); parts (i) and (j) are for aa H and the δ-corrected a K values from Sodankylä, a NGK/s(δ), parts (k) and (l) are for aa H and the δ-corrected a K values from Eskdalemuir, a ESK/s(δ). For comparison, the bottom panel (parts m and n) compares the hemispheric homogenized indices aa HN and aa HS. In each panel, the grey area defines the estimated ±1σ uncertainty in aa H.
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