Age-relative error with or without microscopic diffusion, with different assumptions on observational errors in δν. The blue lines corresponds to the standard recovery and serve as a reference. The other lines show the envelope boundaries when data are sampled from the standard grid and reconstructed on a grid that neglect microscopic diffusion. The magenta solid line corresponds to a recovery without δν; the magenta dashed line corresponds to results obtained with an observational error of 5% in δν; the green dot-dashed line comes from a scenario with an error of 2% on δν.