Gaussian-Shaped Emission Line

The last selectable standard spectrum is a gaussian-shaped emission line. The parameters are: central wavelength, FWHM and total flux. The magnitude of the source is not a free parameter anymore due to the total flux given by the user:

$$\lambda {\frac{{1}}{{\upsigma \sqrt{2\uppi}}}} {\frac{{(\lambda-\Gamma)^2}}{{2\upsigma^2}}}$$ (14)

$\upsigma$ is given by FWHM/2.35, FLUX the total flux and $\Gamma$ the central wavelength.