How can I add another column to this table

Question

This is a continuation of another question.

Here is the code for the table

\documentclass{article}
\usepackage{geometry}
  \geometry{a4paper,   % note: 'a4paper', not 'a3paper'
            showframe, % omit 'showframe' option in real document
            %total={170mm,300mm},
            %left=20mm, top=20mm,
            margin=20mm
  }
\usepackage{siunitx,booktabs}
\newcolumntype{T}[1]{S[table-format=#1]}

\begin{document}
\begin{center}
\sisetup{round-mode=places,round-precision=2}
\begin{tabular}{ @{} 
                 T{1.2} 
                 *{5}{T{2.2}} 
                 S[table-format=2.3,round-precision=3] 
                 S[table-format=1.3,round-precision=3] @{} @{}}
 \toprule
 {Mass/ $m$, \unit{\kilo\gram}} &
 \multicolumn{6}{c}{Frequency/ $f$, \unit{\hertz} $\pm 0.001$} & {Tension/ $T$, \unit{\newton}} \\
 \cmidrule(lr){2-7}
 & {Trial 1} & {Trial 2} & {Trial 3} & {Trial 4} & {Trial 5} & {Average} \\
 \midrule
 0.050 & 16.200 & 16.630 & 16.560 & 16.840 & 16.550 & 16.556 & 0.491 \\
 0.100 & 23.650 & 22.800 & 22.810 & 22.970 & 22.700 & 22.986 & 0.981 \\
 0.150 & 28.060 & 27.650 & 27.600 & 27.470 & 27.440 & 26.644 & 1.472 \\
 0.200 & 34.300 & 32.030 & 32.340 & 32.380 & 32.030 & 32.616 & 1.962 \\
 0.250 & 35.500 & 35.480 & 35.420 & 35.520 & 35.350 & 35.454 & 2.453 \\
 0.300 & 38.780 & 38.820 & 38.580 & 39.000 & 38.790 & 38.794 & 2.943 \\
 0.350 & 41.800 & 42.050 & 41.750 & 41.980 & 41.950 & 41.906 & 3.434 \\
 0.400 & 44.400 & 44.760 & 44.670 & 45.020 & 44.900 & 44.750 & 3.924 \\
 0.450 & 47.450 & 47.550 & 47.520 & 47.500 & 47.650 & 47.534 & 4.415 \\
 0.500 & 50.350 & 50.190 & 49.840 & 50.170 & 49.900 & 50.090 & 4.905 \\
 \bottomrule
\end{tabular}
\end{center}

\end{document}

How can I add additional columns on the right just like the tension column?