Usually {HEAD ~ the lateral dimensions} of the fibers range from {TAIL ~ 20 μm} to 125 μm 
Usually { HEAD ~ the lateral dimensions } of the fibers range from { TAIL ~ 20 μm } to 125 μm
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH