SED fittings for cores G23.44-l, G23.97S, G25.71-l, and G25.71-u, combining 6 cm (CORNISH), 1.3 cm (VLA), 3.5 mm (PdBI), 1.3 mm (PdBI), 870 μm (ATLASGAL), 850 μm (SCUBA), and 450 μm (SCUBA). The spectral index of the dust emissivity is set as β = 1.7. The ionised gas and cold dust components were shown in dashed blue and dashed green lines, respectively. For core G25.71-u, there is no observation at 1.3 mm for its offset away from the primary beam size, so we take the measurements on 850 and 450 μm flux as two upper limits.