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tokens: centred at , . Small-diameter (7′) WISE H II regions from Anderson et al. (2014) are marked by white squares and two extended WISE H II regions (diameter > 20′) are indicated by blue dashed circles. Three very extended radio sources in both λ 21 cm and λ 6 cm images are SNR G126.2+1.6, SNR G127.1+0.5 and H II region G127.9+1.7 (DU 65, Dubout-Crillon 1976 , red rectangle), which is missing in the WISE H II region catalogue. Lower left panel : its H α emission is shown overlaid by the λ 6 cm total-intensity emission. Lower middle and lower right panels : TT-plot results for DU 65 by using the Urumqi λ 6 cm against the Effelsberg λ 21 cm data and the Effelsberg λ 11 cm data. 4.1.1. New H II regions In addition to the missing known extended H II regions in the WISE H II region catalogue, a few new Galactic H II regions and H II region candidates are also discovered in the Urumqi λ 6 cm survey. They are G68.4+0.2, G76.7−1.2, G94.4+2.7, G139.2−3.0, G139.9−2.0, G172.3+1.9 (H II region candidate), G186.7−4.0 (H II region candidate), G210.8−2.6 and G212.9−3.7. We show them in Figs. 4 , 5 and 6 . For G68.4+0.2, G76.7−1.2 and G94.4+2.7 it is difficult to compare the λ 6 cm radio emission with the WISE 12 μ m infrared emission due to the large difference in angular resolution. We extracted the 1′ resolution CGPS λ 21 cm images and found that the associated infrared emission are not for the entire radio source but for partial shell- or ridge-like structures. The TT-plots confirmed their thermal origin. For the six remaining newly identified H II regions and H II region candidates, we found supporting evidence both in the TT-plot results and the associated H α emission, except for G172.3+1.9 and G186.7−4.0. For G172.3+1.9, we did not obtain a reliable TT-plot result and for G186.7−4.0, which is not fully covered by the Effelsberg λ 21 cm survey, the sensitivity of the Effelsberg λ 11 cm data is not enough for a clear determination. The H α image quality is not high in the south-east part of G172.3+1.9, but the data show a good correlation in the north-west part. Fig. 4. New H II regions G68.4+0.2, G76.7−1.2 and G94.4+2.7 identified in the Sino-German λ 6 cm survey. We show λ 6 cm images and WISE 12 μ m emission overlaid by CGPS λ 21 cm total intensity in the upper and middle panels . We present their TT-plot results in the lower panels . Fig. 5. Newly identified H II regions G139.2−3.0, G139.9−2.0 and G172.3+1.9. H α emission overlaid by Urumqi λ 6 cm total intensity contours are shown in the upper panel . The image quality of the south-east part of G172.3+1.9 is not good; however, correlation can be clearly recognised in the north-west part. TT-plot results are displayed in the lower panels . Fig. 6. Upper panels from left to right : λ 6 cm image, H α emission overlaid by Effelsberg λ 11 cm total intensity and the TT-plot result for the new H II region G212.9−3.7. Lower panels from left to middle : H α emission overlaid by Urumqi λ 6 cm total intensity