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Table 1

Characteristics of the limb datasets analysed in this study.

Latitude Date LS Spectral resolution Number of co-added spectra

40°N 23 Aug. 2011 25° 0.5 cm-1 120
0° 3 Jan. 2008 340° 0.5 cm-1 57
35°S 4 Jan. 2012 30° 0.5 cm-1 82
80°S 28 Jun. 2007 333° 1.5 cm-1 100

Notes. LS refers to solar longitude (0° at northern spring equinox).

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