{HEAD ~ The capillary} is circular in {TAIL ~ cross section}, this being obtained by drilling or extrusion of a cylindrical bar made of dielectric material 
is circular in
{ HEAD ~ The capillary } is circular in { TAIL ~ cross section } , this being obtained by drilling or extrusion of a cylindrical bar made of dielectric material
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH