{HEAD ~ The proportion} of the hydroxide phase is in the range 0.15% to 3% by weight of yttrium expressed as yttrium hydroxide relative to {TAIL ~ the total weight} of particles 
{ HEAD ~ The proportion } of the hydroxide phase is in the range 0.15 % to 3 % by weight of yttrium expressed as yttrium hydroxide relative to { TAIL ~ the total weight } of particles
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH