tuan - 团- how to pronounce

hi all

i am new to this site (and to the language) so please bear with me

I know that the pinyin spellings such as "xuan" is pronounced more like "xuen" - e.g. xuan ze is pronounced like "xuen ze" and "quan" is more like "quen"

so is "tuan" pronounced more like "tuen" or is the "a" in "tuan" actualy heard? e.g. like how  "duan" or "guan" is pronounced.

many thanks!