Comparison of the F1-F2 Formant charts for all Wells lexical sets between accents.

The compiled list of lexical sets used can be found here.

Sets are grouped as follows, in accordance with RP phonology:

Group	Placements	Sets
A	Close to Close-Mid	happY, FLEECE, KIT, DRESS, FOOT, GOOSE
B	Mid to Open-Mid	lettER, commA, NURSE, STRUT, THOUGHT, NORTH, FORCE
C	Near-Open to Open	TRAP, BATH, PALM, START, LOT, CLOTH

This is done solely for convenience in graphing.