Each light modulator in {HEAD ~ the first subset} of light modulators modulates light along a first axis of reflection, while each light modulator in the second subset of light modulator modulates light along {TAIL ~ a second axis} of reflection 
Each light modulator in { HEAD ~ the first subset } of light modulators modulates light along a first axis of reflection , while each light modulator in the second subset of light modulator modulates light along { TAIL ~ a second axis } of reflection
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH