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