This article has an erratum: [https://doi.org/10.1051/0004-6361/201322612e]
Estimated maximum contribution from UCH ii regions plotted against 28.4 GHz AME residual flux density. The most significant AME sources (σAME > 5 and ) are shown as filled black circles, while non-AME regions (σAME < 2) are shown as unfilled circles. Semi-significant AME sources (σAME = 2–5) are shown as filled grey circles. Significant AME regions that have a potentially large contribution from UCH ii () are re-classed as semi-significant (grey circles) and are highlighted by star symbols in this plot. Regions with no matched UCH ii regions are set to 0.01 and lie on the bottom of the plot. The dashed lines correspond to different maximum fractions of UCH ii flux density: 1, 10, 25 (solid line), and 100% of the 28.4 GHz residual flux density. The Perseus (P) and ρ Ophiuchi (R) clouds are indicated.
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