Evolution of the mass fraction of unprocessed pebbles with time at different locations in the disk (contours). The bold black line represents the inner disk composition at 1 AU. The symbols show normalized nucleosynthetic measurements, for different elements as indicated by the legend. The different meteorite classes are colored from red to blue. The corresponding estimates for their accretion ages are given with vertical error bars (or upper limit arrows), slightly displaced for the different elements for visibility. Horizontal error bars are the uncertainties on the normalized nucleosynthetic composition.