The synchronization of dengue incidence across geographic regions of Perú. Left panels show the wavelet coherence computed using the Morlet wavelet function from the weekly dengue incidence between jungle and mountain regions (a), mountain and coastal regions (b) and jungle and coastal regions (c), respectively. The colours are coded a dark blue, low coherence and dark red, high coherence. The dotted-dashed lines show 5% significance levels computed from 1000 bootstrapped series. The cone of influence indicates the region not influenced by edge effects. Right panels show the corresponding oscillating components computed with the wavelet transform in the 0.8-1.2 yr band for (d) jungle (red line) and mountain regions (black line), (e) mountain and coastal regions (blue line), and (f) jungle and coastal regions. The dot-dashed line is the instantaneous time delay in weeks (ΔT) between the oscillating components of two time series. (See  for the computation of this delay).