(a) X_CH3OH(CH₃CONH₂) as a function of X_CH3OH(NH₂CHO). The cyan line and shaded region denote the power-law fit and its uncertainty derived in this work; the red line and shaded region represent the fit and its uncertainty obtained by combining our sources with previous studies; and the gray line shows the fit from Colzi et al. (2021). Symbols and colors correspond to different sources, as shown in the legend. (b) NH₂CHO/CH₃CONH₂ ratios. Ratios from this work are indicated in cyan, while those from previous studies are shown in different colors. The cyan line and shaded region represent the mean ratio and its uncertainty for our data, and the solid red line and shaded region represent the combined sample ratio.