Errata

Philosophical Magazine, 83(27), pp. 3117–3132.

	Page 3123, equation (5c) should read and −8 × 10−15 in the subsequent line should read −6 × 10−5.
	Page 3123, line 5 from the bottom: “8 × 10−5” should read “6 × 10−5”.

Taylor & Francis apologises for this error and any consequent inconvenience caused to the authors or readers.