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The article discusses a study that aims to examine the effect of temperature and vapour trajectory controls on the stable-isotope signal in the winter snowpacks of the Rocky Mountains in Canada. The researchers used alpine snow-pit data from two alpine field sites at the Haig Glacier, Alberta and the Opabin Glacier in British Columbia. The snow pits that were taken from three different seasons were used to assess the effect of temperature. The study found that separation is driven by the mean temperature of each class and not a direct result of vapour pathway.