... pixels¹

In imaging mode n _pix of a point source is calculated within a 2 FWHM diameter aperture: n _pix  = $\pi$$\left(\vphantom{\frac{\mathrm{seeing}}{\mathrm{scale}} }\right.$${\frac{{\mathrm{seeing}}}{{\mathrm{scale}}}}$$\left.\vphantom{\frac{\mathrm{seeing}}{\mathrm{scale}} }\right)^{2}_{}$. In spectroscopic mode the program uses n _pix = 2 ^. ${\frac{{\mathrm{seeing}}}{{\mathrm{scale}}}}$. For an extended source n _pix is set to 1 for both dimensions of the source.

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