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  1. or download this
    x1   = 256080
    x2   = 258160
    diff = 2080.00000000003
    
  2. or download this
    x1   = 2.56080            e5
    x2   = 2.5816000000000003 e5  (error ignored when printed)
    diff = 2.08000000000003   e3  (error visible when printed)
    
  3. or download this
      DB<115> $x1 = 2.56080e5
     => 256080
    ...
    
      DB<118> $x2-$x1
     => 2080.00000000003       # error can't be ignored any more