{HEAD ~ Thermal control}, including rapid thermal response to compensate for temperature perturbations induced by periodic introduction of assay cartridges which are at a temperature less than that of the chamber, is accomplished by heating elements located above and below {TAIL ~ the conveyor} 
{ HEAD ~ Thermal control } , including rapid thermal response to compensate for temperature perturbations induced by periodic introduction of assay cartridges which are at a temperature less than that of the chamber , is accomplished by heating elements located above and below { TAIL ~ the conveyor }
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