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Authors:

• C. Plumpton ⁰,
• R. L. Perry ¹,
• E. Shipton ²

1. C. Plumpton

   1. University of London School Examinations Department, Queen Mary College, University of London, UK
      

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2. R. L. Perry

   1. University of London School Examinations Department, Queen Elizabeth College, University of London, UK
      

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3. E. Shipton

   1. University of London School Examinations Department, Owen’s School, Potters Bar, UK
      

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