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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