Ice versus gas abundance correlation for N-bearing species with respect to CH₃OH. The crosses are abundances derived for our organic-poor MYSOs, and the red squares are the values derived by Bisschop et al. (2007). An arbitrary error of 20% has been assumed for the latter values. For the two top plots, the black crosses represent the HNCO over CH₃OH abundance derived for the compact component, while the blue crosses correspond to the HNCO abundance calculation for an extended component.