[NTG-context] Western transliteration of Sanskrit

Hi, I'd like to have a table with all available commands (like \d{..} for macron) that support diacritic signs needed for western transliteration of Sanskrit. Especially the dot above an n or m: In an old TUGboat article (Volume 20 (1999), No. 2) that I found by Google I read that the dot above an n should be "n (Vulthius). But here it stays the " (like the German Umlaut). Anybody knows more? Steffen