\begin{table}%T3
\caption{Calculated F~III Stark {\it FWHM} ($W$ in pm) and shift ($d$ in
pm) values for electrons (a), protons (b) and helium ions (c) as
perturbers for various plasma temperatures ($T$ in $10^3$~K) and
$10^{23}$~m$^{-3}$
 perturber density. $\langle \lambda \rangle$ represents the mean wavelength in the multiplet.
 Negative shift is toward the blue.}\label{t3}
%\vskip 3mm 
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  \hfil#& # \tabskip=0pt\cr\tablerule\noalign{\vskip0.75mm}\tablerule
&&Transition\hfil&& $\langle \lambda \rangle$\hfil && &&
\multispan{11}\hfil\vbox{\vskip 2pt \hbox{\hfil $T$  ($10^3$
K)}}\hfil &\cr \noalign{\moveright 109.5pt \vbox{\hrule width315.5pt}}
&&multiplet\hfil&& (nm)\hfil&& &&\vbox{\vskip 3pt \hbox{10}}\hfil
&&20\hfil &&50\hfil &&100\hfil &&150\hfil &&300\hfil &\cr
\noalign{\moveright 109.5pt \vbox{\hrule width315.5pt}}
&&\omit&&\omit&&\omit&&\vbox{\vskip 3pt \hbox{$W$ ~~~~~~~ $d$~~}}&&$W$ ~~~~~~~
$d$~~&&$W$ ~~~~~~~ $d$~~&&$W$ ~~~~~~~ $d$~~ &&$W$ ~~~~~~~ $d$~~&&$W$ ~~~~~~~ $d$~~&\cr
\noalign{\hrule} &&\vbox{\vskip 4pt \hbox{$\rm 3s\ ^4P {-} 3p\
^4D^o$}}&&312.52&& a\hfil&&
21.5~~$-$0.40&&15.3~~$-$0.61&&10.4~~$-$0.60&&8.41~~$-$0.70&&7.59~~~0.68&&
6.51~~$-$0.62&\cr && (1)\hfil &&\omit&&
b\hfil&&0.14~~$-$0.10&&0.30~~$-$0.20&&0.59~~$-$0.37&&0.78~~$-$0.50&&
0.87~~$-$0.55&& 1.02~~$-$0.66&\cr &&  && &&
c\hfil&&0.22~~$-$0.10&&0.42~~$-$0.19&&0.68~~$-$0.33&&0.80~~~0.41&&
0.87~~$-$0.46&& 0.99~~$-$0.55&\cr \noalign{\hrule}}}}
\end{table}