Abundances vs. H₂ for CH₃OH, C₂ H₅OH, CH₃ CHO, CH₃ OCHO, HC₃ N, CH₃ CN, CH₂ CHCN, and C₂H₅CN using IC 5 with a density of 10⁹ cm⁻³ and a fast warm-up time of 50 kyr are shown for G35.20 A (left), B1/B2 (middle), and B3 (right). The time period shown is only a part of the modeled time, from 18 000 to 35 000 yr. The time range in which all abundancescan be reproduced with an error of 1 order of magnitude are shaded in gray. The abundance of C₂ H₅CN in A and B3 is not reproduced so a small black ellipse shows the gap between the lower abundance limit and the modeled abundance.