Also the height of the top wall above the conveyor is sufficiently small to accommodate only the environmental sensors, the assay cartridges, and {HEAD ~ a clearance space} between the sensors and {TAIL ~ the cartridges} 
between
Also the height of the top wall above the conveyor is sufficiently small to accommodate only the environmental sensors , the assay cartridges , and { HEAD ~ a clearance space } between the sensors and { TAIL ~ the cartridges }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL