Molecules classified by the dependence of their abundance profile in the midplane of the disk. Top and bottom: flat and non-flat abundance profiles, respectively. Left and right: abundance profile evolving in time and not evolving in time, respectively, and/or affected or not affected by physical conditions. A species is considered unaffected if the radial profiles are within a factor of 2 from each other. There are no species whose profile evolves in time that display a flat profile in all conditions, and no species with a nonflat profile that are unaffected by physical conditions.