The pink dot in the chart shows F1 and F2 values for the vowel in flan as spoken by an American (in pink); the blue dots show a variety of vowels spoken by a Scot. US flan is closer to Scottish /ɔ/ and /o/ than /a/, when the values for these vowels are measured from the following handful of words which happened to be in my files:
- /o/ from coat, rope, story, roadblock, gold-digger
- /ɔ/ from fawn, lorry, chops, quantity, conscience
- /a/ from lamb, grandmother, blackbird, glass, magpie, magic
The other vowels are just added in for comparison – I started off with /i/ (as in deed, bean, leaf, bean, beam) and /u/ (as in queue, toothpaste, cartoon, saloon, movement, tuna) to complete the triangle with /a/ (except that it didn’t make a triangle, somewhat predictably, hence the inclusion of /o/). You can fill in /e/ and /ɛ/ for yourself (that’s as in bait, gate, etc for /e/ and bet, deck, etc for /ɛ/) – they’d go down the right hand side somewhere (see here for a rough idea – and even more vowels!).