{HEAD ~ The mass} of fibers is characterized as possessing {TAIL ~ a bulk density} of from 0.02 to 0.40 gram/cubic centimeter, and each of the fibers is characterized as having an average diameter of from 3 to 10 microns 
is characterized as possessing
{ HEAD ~ The mass } of fibers is characterized as possessing { TAIL ~ a bulk density } of from 0.02 to 0.40 gram / cubic centimeter , and each of the fibers is characterized as having an average diameter of from 3 to 10 microns
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH