Figure 4From: Epochal changes in the association between malaria epidemics and El Niño in Sri Lanka(a) Monthly average rainfall climatology for epidemic start years (1877, 1880, 1884, 1891, 1906, 1911, 1914, 1919, 1923, 1928, 1934, 1939, 1943, 1945, 1967, 1986, 1990) and for non-epidemic years for the period of 1876 to 2000. (b) Average monthly rainfall, and that during El Niño and La Niña phases. The error bars represent the standard error of the estimate.Back to article page