{HEAD ~ The melt circulation} through the conduits is caused by the difference in the levels and {TAIL ~ densities} of the melt in these vessels 
{ HEAD ~ The melt circulation } through the conduits is caused by the difference in the levels and { TAIL ~ densities } of the melt in these vessels
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH