When I looked up dialectal data, I often encountered the phonetic transcription [an] but had no idea how it was actually pronounced. For example, I know for certain that /an/ is fronted or centralized in Standard Mandarin (e.g., 幹 gàn [kɜn] in 幹什麼, not to mention 閻 yán [i̯ɛn] in 閻羅王) although it is described as [an] in Wikipedia's Standard Chinese phonology. To me, [a] denotes a back vowel (as in the word kanji in American English), clearly different from the centralized [ɜ] (as in Taiwanese Hokkien 幹[kɜn]你娘, often misleadingly transcribed as [kan]). Thus when I see something like 長沙 (湘語) 幹 [kan] or 柳州 (官話) 幹 [kan], I really don't know whether it is truly [an] or something else. Does [an] (with a back vowel) actually exist in modern Chinese languages? (I mean: in normal speech, not in affected enunciation like 園 yuán [y̯an] pronounced by a singer in a song) If it does, please identify the dialect or language and give me a word or example in which [an] can be found. Thank you.