Editing 450 stuff

=== spot size projections ===
0.7mm aperture at 7.25" from origin => 0.2687" at 50cm above road surface (origin 51" below, 19.7" above)

1.0mm aperture at 7.25" from origin => 0.3839" at 50cm above road surface (same).

==== sample rate info ====
3 slots @ 3500 rpm 1000 pixel/raster => 175 raster/second or 5.7msecond/raster, 5.7usecond/sample

vehicle @ 2mph => 2.93 feet/second => 35.2inch/sec => 0.2011inch/raster

vehicle @ 10mph => 14.667 feet/second => 176 inch/sec => 1.0057 inch/raster