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"The chimney had a height of 195 metres (640 ft) and a diameter of 10 metres (33 ft) with a collection area (greenhouse) of 46 hectares (110 acres) and a diameter of 244 metres (801 ft)".
The area of a circle 244 m in diameter is 46k square meters or 4.6 hectares, not 46 h. 199.167.119.198 (talk) 15:00, 6 August 2021 (UTC)[reply]