Figure 4
From: PM2.5 in Beijing – temporal pattern and its association with influenza
Wavelet power spectrum analysis of monthly PM 2.5 concentrations from year 2008 to 2013 in Beijing. The color code for power values from dark blue (low value) to dark red (high value). The dotted white lines show the maxima of the undulations of the wavelet power spectrum and the dotted-dashed show the α = 5% significant levels and the cone of influence which indicates the region not influenced by edge (following the algorithm/software by Cazelle et al. 2007).