Panel a: matrice of confidence levels of the models with respect to the observed abundances of nine COMs relative to CH₃OH. The first four panels in this column show, from top to bottom, the results for Sgr B2(N2), N3, N4, and N5, respectively. The bottom panel shows the average matrice for all four hot cores taken together. Panel b: same as (a) but for the abundances relative to CH₃OH of the O-bearing species CH₃OCHO, CH₃OCH₃, CH₃CHO, C₂H₅OH, and NH₂CHO only. Panel c: same as (a) but for the abundances relative to CH₃CN of the cyanides C₂H₅CN and C₂H₃CN only.