  The effects of telluric absorption on infrared spectra present a problem for
the observer. Strong molecular absorptions from species whose concentrations
vary with time can be particularly challenging to remove precisely. Yet
removing these effects is key to accurately determining the composition of many
astronomical objects, planetary atmospheres in particular. Here we present a
method for removing telluric effects based on a modelling approach. The method
relies only on observations usually made by the planetary astronomer, and so is
directly comparable with current techniques. We use the modelling approach to
process observations made of Jupiter, and Saturnian moon Titan and compare the
results with those of the standard telluric division technique, finding the
modelling approach to have distinct advantages even in conditions regarded as
ideal for telluric division.
