The estimates of non-linear patterns between mean temperatures and malaria incidences, with three to ten weeks being the lag range of temperatures. The Y-axis represents the logarithm value of the relative risk ratio compared to the reference temperature 0°C. The solid line is the estimated non-linear curve, with dashed lines indicating its 95% confidence interval. On the one hand, A, B, C, D show the scenario for the fourth week lag; E, F, G, H show the scenario for the sixth week lag; and I, J, K, L show the scenario for the eighth week lag. On the other hand, A, E, I are at the first (lowest) DTR level; B, F, J are at the second DTR level; C, G, K are at the third DTR level; and D, H, L are at the fourth (highest) DTR level. The range of X-axis depends on the corresponding range of mean temperatures.