Fig. 3
Changes in the elevation threshold for malaria over time in the Ethiopian Highlands. Solid lines: mean elevation above mean sea level (m) where the 10-day average minimum temperature in a year never exceeds 18 °C (red) and 15 °C (blue). Dashed lines indicate the uncertainty in mean elevation. Coloured bars show anomalous values (°C) of the October–December “Niño 3.4” sea surface temperature index in the Pacific Ocean. Trend lines and associated slopes are also shown [42]