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16.11 Error codes
In addition to the standard error codes for invalid arguments the functions can return the following values,
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GSL_EMAXITER
the maximum number of subdivisions was exceeded.
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GSL_EROUND
cannot reach tolerance because of roundoff error, or roundoff error was detected in the extrapolation table.
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GSL_ESING
a non-integrable singularity or other bad integrand behavior was found in the integration interval.
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GSL_EDIVERGE
the integral is divergent, or too slowly convergent to be integrated numerically.