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<B>NUMERIC ACCURACY</B><P>
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The keyword parameters <em>accuracy=a</em> and <em>iterations=i</em>, 
where <em>a</em>and <em>i</em> must be positive integer numbers, control the 
iterative algorithms: the iteration is continued until 
the local error is below 10**-a; if that is impossible 
within <em>i</em> steps, the iteration is terminated with an 
error message. The values reached so far are then returned 
as the result. 
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