 \noindent light (adjusted for reasonable values by 299800 km/s):

\begin{tabular}{rrrrrrrrrrrrrrr}
 50 & -60 & 100 &  270 & 130 &  50 & 150 & 180 & 180 & 80 & 200 & 180 & 130 & -150 &  -40 \\
  10 & 200 & 200 & 160  & 160 & 160 & 140 & 160 & 140  & 80  &  0 &  50 &  80 & 100 &  40 \\
  30 & -10 &  10 &  80  & 80 &  30  &  0  & -10 & -40 &   0 &  80 &   80 &  80 &   60 &  -80 \\
 -80 & -180 &  60 & 170 & 150 &  80 & 110  & 50  & 70  & 40 &  40 &  50 &   40 &  40 &  40 \\
  90 &  10 &  10 &  20 &   0 & -30 &  -40 &  -60 &  -50 & -40 & 110 & 120 &  90 &  60 &   80 \\ 
 -80 &  40  & 50  & 50 & -20  & 90  & 40 & -20  & 10 & -40 &  10 & -10 &  10 &  10 &  50 \\
  70 &  70 &  10 & -60 &  10 & 140 & 150 &   0 &  10 &  70 & & & & & \\
\end{tabular}
