A couple of special “magic squares”* that are magic if - and ONLY if - all numbers within are rounded to one particular degree of accuracy.
Round the numbers to 1 d.p. and the square is NOT magic, round to 6 d.p. and the square is NOT magic - but round them to a particular accuracy and you will suddenly get a magic square.
*all rows and columns sum to the same value - but NOT diagonals
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