\begin{table}[t]
	\centering
	\caption{\label{tab:los}
		List of symbols commonly used in this paper.
	}
	\addtolength{\tabcolsep}{-2pt}
	\begin{tabular}{llr}
		\textbf{Symbol} & \textbf{Meaning} & \textbf{Def.}\\
		\hline
		$\Lv$, $\Lins$ & interior and in-scattered radiances & (\ref{eqn:rte3d}, \ref{eqn:rte3d_Lins})\\
		$\Ls$, $\Lr$, & interfacial and reflected/refracted radiances & \eqref{eqn:rte3d_re}\\
		$\Lve$, $\Le$ & volumetric and interfacial emissions & (\ref{eqn:rte3d_src}, \ref{eqn:rte3d_re}) \\
		\hline
		$\kernelT$, $\kernelC$ & transport and collision operators & (\ref{eqn:rte3d_kernelT}, \ref{eqn:rte3d_Lins})\\
		$\kernelS$ & interfacial scattering operator & \eqref{eqn:rte3d_kernelS}\\
		\hline
		$\dist$ & distance for the ray $(\bx, -\bom)$ to intersect $\boundary$ & \eqref{eqn:rte3d_dist}\\
		$T(\bx, \by)$ & transmittance between $\bx$ and $\by$ & \eqref{eqn:rte3d_trans}\\
		$\sigT$, $\sigS$, $\sigA$ & extinction, scattering, and absorption coeff. & (\ref{eqn:rte3d_trans}--\ref{eqn:rte3d_src})\\
		$\phase$ & single-scattering phase function & \eqref{eqn:rte3d_Lins}\\
		$\bsdf$ & cosine-weighted BSDF & \eqref{eqn:rte3d_re}\\
		\hline
		%$\domain$, $\boundary$ & integral domain and its boundary & \eqref{eqn:thm1}\\
		$\dev{f}$ & total derivative of $f$ wrt. all scene parameters $\bparam$\\
		$\sdev{f}$, $\dot{f}$ & partial derivative of $f$ wrt. one scene parameter $\param$\\
		\hline
		$\langle \bm{u}, \bm{v} \rangle$ & dot (inner) product between vectors $\bm{u}$ and $\bm{v}$\\
		$\bx \to \by$ & unit vector pointing from $\bx$ to $\by$, i.e., $\frac{\by - \bx}{\| \by - \bx \|}$\\
		$\bx', \; \dbx'$ & $\bx - \tau\bom, \quad \dbx - \tau\dbom$\\
		$\bx_0, \; \dbx_0$ & $\bx - \dist\bom, \quad \dbx - \ddist\bom - \dist\dbom$\\
	\end{tabular}
\end{table}
