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. 2021 May 14;20:219. doi: 10.1186/s12936-021-03722-1

Fig. 4.

Fig. 4

Estimated total deltamethrin concentration (mg/m2) measured by X-ray fluorescence (XRF) at the survey time-points. The time-point of 0 represents values on unused long-lasting insecticidal nets (LLINs) that were from the same batch as those distributed. The dashed horizontal line represents the threshold of 25 mg/m2 and the solid horizontal line represents the threshold of 10 mg/m2