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