Ratio of episodes per year with LLIN mass distribution to episodes with no intervention, depending on pre-intervention EIR, attrition half-life and model variant. Each green line represents the median number of episodes of 10 simulation runs (each with unique random seed) with LLINs distributed to 70% of the people (population size = 10,000) at the beginning of year 6, the number of episodes in each intervention simulation run divided by the number of episodes in a simulation run without LLINs (also with unique random seed). Even though the values are annual totals, they are connected with lines. A column graph would be more appropriate, but less convenient for plotting multiple data series. The red semi transparent polygons represent the range of the 10 runs. Per panel, there are 14 green lines (and 14 red polygons), each representing a malaria model variant. The first column of panels (a-c) shows results for attrition with a three year half-life and the second column (d-f) for attrition with a five year half-life. The panel rows show results for pre-intervention EIRs of two (a & d), 16 (b & e), and 128 (c & f) infectious bites per adult per annum (ibpapa). Blue lines represent the proportion of people using an LLIN, added to one. Horizontal lines: dashed, ratio = 1; dotted, ratio = 0.