Numerical integration error codes - GNU Scientific Library -- Reference Manual
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### 17.12 Error codes

In addition to the standard error codes for invalid arguments the functions can return the following values,

`GSL_EMAXITER`
  the maximum number of subdivisions was exceeded.
`GSL_EROUND`
  cannot reach tolerance because of roundoff error, or roundoff error was detected in the extrapolation table.
`GSL_ESING`
  a non-integrable singularity or other bad integrand behavior was found in the integration interval.
`GSL_EDIVERGE`
  the integral is divergent, or too slowly convergent to be integrated numerically.

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