Telluric Correction
It is possible to correct for the effects of telluric contamination in an astronomical spectrum. This is done by preparing a telluric correction function, made by dividing a model spectrum of a star by an observation of an astronomical photometric standard stars. This function can then be multiplied by an astronomical observation at each wavelength point.
While this method can restore the original shape of the spectrum, the regions affected can be prone to high levels of noise due to the low number of counts in that area of the spectrum.
Read more about this topic: Telluric Contamination
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