The number of guide bars in each circular concentric series increases from {HEAD ~ the radially inner series} to the radially outer series of {TAIL ~ guide bars} 
The number of guide bars in each circular concentric series increases from { HEAD ~ the radially inner series } to the radially outer series of { TAIL ~ guide bars }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL