After using three different bands in filtering, cross-correlation analyses of the two filtered time series have been made. Figure 2 shows the three different results in using solid, dash, and dot lines, respectively. The two cutting points in days of a band filter are expressed nearby the corresponding straight line. The level of significance, expressed by the straight line, comes from a Monte Carlo simulation done under the same conditions as that of the actual two time series.
Figure 2: Cross correlation between LR(77) and PL time series
as a function of phase lag at interannual time scales
Direct comparisons of the filtered time series in using three different band filters are shown in Fig. 3.
Figure 3: Comparison between LR(77) and PL time series
in no phase lag at interannual time scales