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\input arrows.tex
$$
\vcenter {
   \def \hfq {\hfil \ }
   \offinterlineskip
   \halign {
   % preamble
      &\hfq #\hfq
   \cr
      $t$& \vrule depth 5pt & 
      $-\infty $&& $-7/3$&& $0$&& $1$&& $+\infty $&
   \cr
   \noalign{\hrule}
      $x' (t)$& \vrule height 10pt depth 3pt &
      & $-$& $\approx -9, 33$& $-$& $0$& $+$& $1$& $+$&&
   \cr
   \noalign{\hrule}
      \bbuucenter{$x (t)$}& \vrule& 
      \bbuup{$+\infty $}&
      \bbup{\brightdownarrow} & \bup{$\approx 14, 9$}& 
      \brightdownarrow & \down{$4\strut $}& 
      \bbrightuparrow & \bbup{$6$}& \bbup {\bbrightuparrow }& \bbup {\bbup {$+\infty $}}
   \cr
   \noalign{\hrule}
      $y' (t)$& \vrule height 10pt depth 3pt &
      & $+$& $0$& $-$& $-7$& $-$& $0$& $+$&&
   \cr
   \noalign{\hrule}
      \bbuucenter{$y (t)$}& \vrule& 
      \down {$-\infty $}&
      \brightuuparrow & \bbuup {$\approx 18, 52$}& 
      \bbup {\brightdownarrow }& \bbup {$4$}& 
      \brightdownarrow & \down{$0$}& 
      \bbrightuuparrow & \bbuup{$+\infty $}
   \cr
}}
$$
\bye