This article has an erratum: [https://doi.org/10.1051/0004-6361/201322612e]
Colour−colour plot of IRAS PSC sources (grey plus symbols) that lie within the apertures of all 98 sources in our sample. UCH ii candidates (solid black squares) tend to have ratios log 10(S60/S12) ≥ 1.30 and log 10(S25/S12) ≥ 0.57, corresponding to the top-right hand corner of this plot (marked with a dashed line).
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