After the separation and {HEAD ~ characterization} of the gaseous components derived from headspace scent analysis, {TAIL ~ identified components} will then be categorized into two groups: those that are non energetic components 51 and those that are energetic components 52 
After the separation and { HEAD ~ characterization } of the gaseous components derived from headspace scent analysis , { TAIL ~ identified components } will then be categorized into two groups : those that are non energetic components 51 and those that are energetic components 52
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