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