Rest-frame 8 μm LF estimated at zs2 using the 1/V_max method. Light blue circles and red squares represent the rest-frame 8 μm LF derived from our 24 μm sample with and without X-ray AGNs respectively. Empty triangles represent the rest-frame 8 μm LF derived by Caputi et al. (2007) at zs2. Asterisks show the local reference taken from Huang et al. (2007) and the dotted line represents the best-fit to these data points with a double power law function with fixed slopes (i.e., φ ∝ L^-0.8 for L < L_knee and φ ∝ L^-3.2 for L > L_knee). The dashed line represents the best fit of the rest-frame 8 μm LF at zs2 assuming that the shape of the rest-frame 8 μm LF remains the same since zs0. The dark shaded area span all the solutions obtained with the χ² minimization method and compatible, within 1σ, with our data points.