The horizontal lands and horizontal ribs can extend continuously in a vertical direction from {HEAD ~ the shoulder region} to {TAIL ~ the base portion} 
The horizontal lands and horizontal ribs can extend continuously in a vertical direction from { HEAD ~ the shoulder region } to { TAIL ~ the base portion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL