The present study has shown that results of high accuracy can be obtained at the cost of computational effort by using a spline fit to the kernel numerators and integrating over each interval analytically. This procedure can be used to quantify the integration error in production methods. It should however be noted that eliminating the integration error for a particular paneling scheme does not yield the fully converged answer for the problem, nor is it necesary to eliminate the integration error to determine the fully converged result.
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