{HEAD ~ A heating or cooling element} is disposed within {TAIL ~ the housing} to heat or cool the cavity 
is disposed within
{ HEAD ~ A heating or cooling element } is disposed within { TAIL ~ the housing } to heat or cool the cavity
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH