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