Additional file 2 of Indoor residual spraying practices against Triatoma infestans in the Bolivian Chaco: contributing factors to suboptimal insecticide delivery to treated households

Additional file 2. Median alpha-cypermethrin a.i. concentrations on filter papers fitted to houses at different wall heights (n = 158 at 0.2 m; n = 157 at 1.2 m; n = 165 at 2 m). The horizontal lines represent the alpha-cypermethrin a.i. target concentration range (50 mg �� 20% a.i./m2). Error bars represents the lower and upper adjacent values to the median; points represent the outside values.