Distribution of flux ratio between GLOSTAR and CORNISH for the 86 UC H II regions (white shaded) that can be assessed using criteria (1)–(3). This gives 38 variable UC H II regions (gray shaded) with flux variation fraction |f_var| > 30%, which includes the purple area for those with flux ratio > 1.3 (or f_var > 30%) and the green area for those with flux ratio <0.7 (or f_var < −30%). The bin size is 0.15.