Fig. 4
Time variation of dlnΩ/dlnr relative to its 19 year time average. The thin stripe in the plot shows the result obtained from data set 15 overploted on data set 16 as there is 288 days overlap between these two data sets. The contours show the two hemisphere averaged butterfly diagram of the sunspot area of 5 per millionths of a hemisphere (courtesy of D. Hathaway; see http://solarscience.msfc.nasa.gov/greenwch.shtml).
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