Letter: Letters : Correction:

Published 28 February 1998

In the article headed “Grim surprise”
(This Week, 7 February, p 13),
the graph showing rising levels of the gas HFC-23 in the atmosphere
contained an error. The y axis should have been labelled parts per trillion
rather than parts per million.

Issue no. 2123 published 28 February 1998

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