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     Math error M6201
 
     'function' : _DOMAIN error
 
     An argument to the given function was outside the domain of legal
     input values for that function.
 
     For example, the following statements generate this error:
 
          result = sqrt(-1.0)   // C statement
          result = SQRT(-1.0)   !  FORTRAN statement
 
     This error calls the _matherr function with the function name,
     its arguments, and the error type. You can rewrite the _matherr
     function to customize the handling of certain run-time floating-
     point math errors.
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