The Dawson integral is defined by @math{\exp(-x^2) \int_0^x dt
\exp(t^2)}. A table of Dawson's integral can be found in Abramowitz &
Stegun, Table 7.5. The Dawson functions are declared in the header file
``gsl_sf_dawson.h'`.

__Function:__double**gsl_sf_dawson***(double*`x`)__Function:__int**gsl_sf_dawson_e***(double*`x`, gsl_sf_result *`result`)-
These routines compute the value of Dawson's integral for
`x`.

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