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The goal of the library is to achieve double precision accuracy wherever
possible. However the cost of evaluating some special functions to
double precision can be significant, particularly where very high order
terms are required. In these cases a mode argument allows the
accuracy of the function to be reduced in order to improve performance.
The following precision levels are available for the mode argument,
GSL_PREC_DOUBLEGSL_PREC_SINGLEGSL_PREC_APPROXThe approximate mode provides the fastest evaluation at the lowest accuracy.