Fig. 2
From: Temperate climate malaria in nineteenth century Denmark
Seasonality of malaria in Denmark. Monthly malaria incidence per 1000 population in Denmark for each of the 19 years during 1862–1880. The seasonal incidence pattern of 1862 is included in the small figure in the upper right corner. The four years with highest annual incidence (1862, 1863, 1873 and 1874) and a rare year with a prominent September peak (1868) are highlighted in color. Black lines represent non-epidemic years. 1862 was excluded from the average (heavy black line)