What is the fine-grained topic of the following text: We have taken advantage of recent unbiased surveys of the Galactic plane such as Herschel/Hi-GAL and VLA/CORNISH to study a bona fide sample of young Hii regions located in the Galactic longitude range 10°–65° by comparing the mid- and far-IR continuum emission to the radio free-free emission at 5 GHz. Only return the topic.
Study of young Hii regions in the Galactic longitude range using Herschel/Hi-GAL and VLA/CORNISH surveys.