IPA Vowel Chart (subset)

{
  "$schema":"https://vega.github.io/schema/vega-lite/v5.json",
  "data":{"values":[
    {"v":"i","F1":280,"F2":2250},{"v":"e","F1":400,"F2":2100},{"v":"ɛ","F1":550,"F2":1850},
    {"v":"a","F1":780,"F2":1450},{"v":"ɑ","F1":750,"F2":1100},{"v":"ɔ","F1":580,"F2":900},
    {"v":"o","F1":420,"F2":700}, {"v":"u","F1":290,"F2":750}, {"v":"ə","F1":500,"F2":1500}
  ]},
  "mark":{"type":"text","fontSize":18,"fontWeight":700},
  "encoding":{
    "x":{"field":"F2","type":"quantitative","scale":{"reverse":true},"title":"F2 (Hz, reversed)"},
    "y":{"field":"F1","type":"quantitative","scale":{"reverse":true},"title":"F1 (Hz, reversed)"},
    "text":{"field":"v","type":"nominal"},
    "color":{"value":"#3666ff"}
  },
  "width":420,"height":340
}