Average meridional velocity, vmer in 5° bins of latitude, b, are shown with a thick black solid line and filled squares with error bars. Values calculated with bins of the same width, but with the first bin in the range 0°–2.5°, are shown with a grey solid line and filled circles with error bars. vmer averages in bins with constant number of data points (n = 5000) are shown with a dotted line and stars with error bars.
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