find again in the case without the data point corresponding to the solar cycle 19 the width only appears to correlate marginally with the sum of sunspot area, that is, rs ’ 0.52 with P(rs,N) = 0.047. We also calculate Kendall’s s and the probability Ps whose meaning is similar to that of P(rs,N). General trends of test results are similar to those of the Spearman rank-order correlation test. In other words, in the case without the data point corresponding to the solar cycle 19 the width only appears to correlate marginally with the sum of sunspot area, that is,s ’ 0.38 with Ps = 0.102. The obtained statistical parameters are listed in Table 1.