{HEAD ~ The angle} between said {TAIL ~ two sensing chip} 31, 32 is a. Then the following formula can be achieved 
{ HEAD ~ The angle } between said { TAIL ~ two sensing chip } 31 , 32 is a. Then the following formula can be achieved
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH