\begin{table}%t1
      \caption{\label{SimParam}Simulation parameters and their \TB{standard nominal} values.}
            $$
         \begin{array}{p{0.75\linewidth}lll}
            \hline\hline
            \noalign{\smallskip}
            Variable name      &  {\rm Symbol}  & {\rm Standard\ value} \\
              \hline
           \multicolumn{3}{c}{\bf{Laser\ parameters}}\\
Launched laser power in air	& P			& 20\ {\rm W}     \\
Mesospheric laser irradiance	& I			& 46 \ {\rm W/m}^2     \\
Central D$_2$ vacuum wavelength	& \lambda		& 589.159\ {\rm nm} \\	
Polarization ellipticity angle	& \chi		& \pm\pi/4\ \ {\rm (circular)} \\
Laser {\it FWHM} linewidth		& \Delta f & 0 \\
Repumping power fraction	& q			& 0.12  \\
Repumping frequency offset 	& \Delta f_{\rm ab} & 1.7178\ {\rm GHz} \\
             \hline
 \multicolumn{3}{c}{\bf{Atomic,\ atmospheric,\ and\ mesospheric\ parameters}}\\
Outer turbulence scale      & L_0   & 25~{\rm m} \\
Geomagnetic field in mesosphere			& B	& 0.228~{\rm G}     \\
One-way transmission at $\lambda$ at zenith	& T_{\rm a}	& 0.84     \\
Average mesospheric temperature		& T_{\rm Na}	& 185~{\rm K}     \\
Sodium centroid altitude (a.s.l.)\tablefootmark{\ast}		& H_{{\rm Na}}	& 92~{\rm km}     \\
Sodium column density				& C_{{\rm Na}}	& 4.0\times\!10^{13}~{\rm m}^{-2} \\
Na beam dwell velocity				& v_{\gamma} & 38~{\rm m/s}     \\
Beam atom exchange rate				& \gamma_{\rm ex} 	& 1/(6.0~{\rm ms}) \\
Na--N$_2$ v.c.c.\tablefootmark{\dagger} cross section		& \sigma_{{\rm Na-N}_2}	& 0.71 \time 10^{-14}~{\rm cm}^2 \\
Na--O$_2$ v.c.c.\tablefootmark{\dagger} cross section		& \sigma_{{\rm Na-O}_2}	& 0.70 \times 10^{-14}~{\rm cm}^2 \\
Weighted v.c.c.\tablefootmark{\dagger} rate						& \gamma_{\rm vcc} & 1/(35~\mu{\rm s}) \\
Na--O$_2$ spin exchange cross sect. at $T_{\rm Na}$	& \sigma_{{\rm Na-O}_2}^{\rm S}	& 0.50 \times 10^{-14}~{\rm cm}^2 \\
Weighted spin-exchange rate at $T_{\rm Na}$			& \gamma_S & 1/(490~\mu{\rm s}) \\
             \hline 
\multicolumn{3}{c}{\bf{Launch\ telescope\ (LT)\ parameters}}\\
Zenith angle					& \zeta	& 30^{\circ}     \\
LT altitude (a.s.l.)\tablefootmark{\ast}				& H_{{\rm tele}}	& 2650~{\rm m}     \\
LT aperture					& D & 40~{\rm cm}     \\
LT beam radius ($1/e^2$)			& w & 0.36 D = 14.4~{\rm cm}     \\
Launched beam rms wavefront error			& {\rm WFE}	& 100~{\rm nm}\approx \lambda/6     \\
Polar angle of $\V{B}$ (laser $\|\ z$)	& \theta	& \pi/2    \\
Azimuth of $\V{B}$ (laser $\|\ z$)	& \phi	& \pi/2   \\
             \hline
         \end{array}
     $$\vspace*{-4mm} 
 \tablefoot{\tablefoottext{\ast}{
 a.s.l. = above sea level.} 
  \tablefoottext{\dagger}{v.c.c. = velocity-changing collision.} }
   \end{table}