2D distribution of the angular offsets between the peak position of each CH₃OCHO source extracted with GExt2D and its associated continuum core extracted with getsf. The different symbols represent the different evolutionary stages of the protoclusters – young, intermediate, or evolved – as shown on top of the plot. The dashed vertical and horizontal lines indicate the x = 0 and y = 0 axes, respectively. The ellipses represent the synthesized beam sizes (FWHM) of the 15 ALMA-IMF B6-spw0 line cubes. The diameter of the corresponding ellipse (i.e., θ_ave) is used as a criterion to associate CH₃OCHO sources with continuum cores toward each protocluster. The methyl formate sources that are not associated with any compact continuum core are not shown in this figure.