\providecommand{\ntables}{7}\providecommand{\algatables}{\StrLeft{ LSfminbnd posik noiseless}{\ntables}}\providecommand{\algbtables}{\StrLeft{ LSstep posik noiseless}{\ntables}}
\begin{tabularx}{1.0\textwidth}{@{}c@{}|*{5}{@{}r@{}X@{}}|@{}r@{}@{}l@{}}
\#FEs/D & \multicolumn{2}{@{}c@{}}{0.5} & \multicolumn{2}{@{}c@{}}{1.2} & \multicolumn{2}{@{}c@{}}{3} & \multicolumn{2}{@{}c@{}}{10} & \multicolumn{2}{@{}c@{}}{50} & \multicolumn{2}{@{}l@{}}{\#succ}\\\hline
\textbf{f19} & \multicolumn{2}{@{}c@{}}{\textit{1.6e-1}:8.6e5 \quad} & \multicolumn{2}{@{}c@{}}{\textit{1.0e-1}:1.4e6 \quad} & \multicolumn{2}{@{}c@{}}{\textit{6.3e-2}:3.1e6 \quad} & \multicolumn{2}{@{}c@{}}{\textit{4.0e-2}:5.2e6 \quad} & \multicolumn{2}{@{}c@{}|}{\textit{2.5e-2}:8.7e6 } & 15 & /15\\
\algatables\hspace*{\fill} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}|}{$\infty$\,\textit{4e5}} & 0 & /15\\
\algbtables\hspace*{\fill} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}}{\textbf{$\infty$}} & \multicolumn{2}{@{\,}X@{\,}|}{$\infty$\,\textit{4e5}} & 0 & /15
\end{tabularx}