"Yes," he said. "The footprints after all, and I can tell you exactly how they would be described by the know-alls. Several confused impressions of the Booted Foot, two being more clearly defined and making an angle of approximately thirty degrees the one with the other. Distance between inside margins of heel, half an inch. Distance between position of outside margin of big toes, approximately ten inches. This latter pair of impressions was found in damp clay but had been protected from recent rain by a bank which overhung them at a height of approximately three feet. There's great virtue in the word 'approximately.'"
(from Colour Scheme, by Dame Ngaio Marsh)