Methyl formate source sizes derived with GExt2D compared to the associated continuum core sizes taken from the unsmoothed core catalog from Paper XII. All sizes are deconvolved from the beam sizes. The black dotted line shows the one to one ratio, while the gray shaded area shows where the ${\mathrm{F}\mathrm{W}\mathrm{H}\mathrm{M}}_{\mathrm{M}\mathrm{F}}^{\mathrm{d}\mathrm{e}\mathrm{c}}$ sizes are within a factor of 2 of their associated ${\mathrm{F}\mathrm{W}\mathrm{H}\mathrm{M}}_{\text{cont }}^{\mathrm{d}\mathrm{e}\mathrm{c}}$ sizes. The different symbols represent the different evolutionary stages of the protoclusters: young, intermediate, or evolved, as shown on top of the figure. The methyl formate sources that are not associated with compact continuum cores are shown with stars. For these sources we assumed $FWH{M}_{\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{t}}^{\mathrm{d}\mathrm{e}\mathrm{c}}={\theta }_{\mathrm{a}\mathrm{v}\mathrm{e}}^{\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{t}}$. The vertical and horizontal dashed lines show the median beam sizes of the line cubes and the continuum maps, respectively.