Graphics, Figures & Tables ⇒ Alignment of Equality Sign in a Table

[pallav]

Thanks to cgnieder for his extensive help in this thread.

I want to do few different things through the attached code for the betterment of the PDF output. Note that the following code gives no error and no warning.

1. Need all the equal sign in column 2 & 4 be aligned.
2. The line under the table should be in gray and should be left justify to the table.
3. Need the 1st row to be centered.
4. I think the table position is not correct, if I am correct, please help me to do so.

Code: Select all

\documentclass[11pt]{article}
\usepackage{caption}
\usepackage{booktabs,multirow,amsmath,amssymb,array}
\usepackage{siunitx}
\usepackage[table]{xcolor}

\begin{document}
  \begin{table}[!ht]
    \caption{Markov channel parameter settings}
    \centering
    \label{tab:markovchapara}
                \tiny\addtolength{\tabcolsep}{-5pt}
								\colorbox{lightgray}{%
    \begin{tabular}{
      c
      >{$}c<{$}
      @{~}
      >{$}c<{$}
      @{~~~~~~~}
      >{$}c<{$}
      @{~}
      >{$}c<{$}
    }\toprule
      \multirow{2}{*}[-0.5ex]{Channel $j$} & \multicolumn{2}{p{9em}}{\text{A long, long, long line, that is broken}}  & \multicolumn{2}{p{9em}}{A long, long, long line, that is broken 2} \\ \cmidrule(r){2-3}\cmidrule(l){4-5}
        & p_j                                     & q_j                 & \pi_{bj}                               & \pi_{ij} \\ \midrule
    1 & \Phi\left(N(t)\right)=- \left( 2\,\alpha\,L-L+2\,\alpha-{\alpha}^{2} \right)     
			& {\lambda}^{2}+\Omega_{{1}}\lambda+\Omega_{{2}}     
			&\Phi\left(N(t)\right)=\frac{\beta\,y^*\alpha}{\left( x^*+\alpha \right) ^{2}}   
			& i\Omega_{{1}}\omega+\Omega_{{2}}  \\[2ex]
    2 & \Phi\left(N(t)\right)=\left( L\,\beta\,\frac{\left( \beta-\gamma \right)}{\delta}\right)     
			& -{\omega }^{2}+a_{{10}}b_{{01}}-\cos \left( \omega \,\tau  \right) a_{{01}}b_{{10}}     
			&\Phi\left(N(t)\right)= \alpha\,L\, \frac{\left( \delta\,\alpha-\gamma\,\beta \right)}{\delta}    
			& -{ \omega} \left( a_{{10}}+b_{{01}} \right)  \\
    \bottomrule
    \end{tabular}}
		The parameters $\alpha$'s are given in the numerical section.
  \end{table}
\end{document}