I want to center the row under the multicolumn heading. In the table below I want to center the M=16 and M=32 without disturbing the layout of content in the figure below. The Red marker showing content required to be centered only.
\begin{table}[h]
\centering
\caption{Values of Dispersion Constant ($R$)}
\begin{tabular}{|l|l|l|}
\hline
\multicolumn{1}{|c|}{\textbf{Algorithm}} & \multicolumn{2}{ c|}{{\boldmath\textbf{Dispersion Constant ($R$)}}}\\
\hline
& \textbf{\centering M=16} & \textbf{\centering M=32}\\ \hline
SCA & R\textsubscript{SCA} = 123 & R\textsubscript{SCA} = 123 \\\hline
\end{table}
MCMA & R\textsubscript{R}=2.55 and R\textsubscript{I}=2.55 & R\textsubscript{R}=2.55 and R\textsubscript{I}=2.55\\
\hline
\multirow{2}*{DD-MCMA} & R\textsubscript{R1} = 123 and R\textsubscript{R2} = 123 & R\textsubscript{R1} = 123 and R\textsubscript{R2} = 123 \\
& R\textsubscript{R1} = 123 and R\textsubscript{R2} = 123 & R\textsubscript{R1} = 123 and R\textsubscript{R2} = 123 \\
\hline
\end{tabular}
\end{table}