The Middle Chinese codas, consisting of glides and , nasals , and , and stops , and , are best preserved in southern dialects, particularly Yue dialects such as Cantonese. In Jin, Lower Yangtze Mandarin and Wu dialects, the stops have merged as a final glottal stop, while in most northern varieties they have disappeared. In Mandarin dialects final has merged with , while some central dialects have a single nasal coda, in some cases realized as a nasalization of the vowel.