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Published online by Cambridge University Press: 01 January 1985
Between proof stage and printing, a line in the paper by Dr Nagaoka published in Vol. 37, May 1984, p. 216, was omitted. The paragraph in question should read: ‘9. conclusions. A method for obtaining a rough estimate of the indicated altitude of cruising aircraft from the ground using data taken by a height-finding radar is presented. The data contains the measured height, the pressure and temperature of the air on the ground.’