Citations and author numbers in six sciences

For 13 journals in six sciences (astronomy, biology, chemistry, engineering, geophysics, and physics) I counted citations in 2017 to 3094 papers published in 2012. It was found that on the average the numbers of citations per paper increased slowly (factor of 1.5) with team sizes but the citations per author are much higher (by an average factor of 6.1) for single-author papers than for large teams. Therefore a researcher will get more credit by working in a small team than in a large one.