Fig. 2
From: Role of temperature in reported chickenpox cases in northern European countries: Denmark and Finland
Seasonality of the monthly reported number for chickenpox cases in Finland from January 1952 to December 1970. a Comparison of the least-squares fitting curves calculated for 1.0- and 0.5-year periodic modes (red line) with chickenpox data (solid line). b Monthly data of the mean temperature (°C). c Power spectral density of the chickenpox data