\documentclass[11pt,a4paper]{article}

\title{Table of systematics for measurement of local gravitational acceleration}
\author{Troels C.\ Petersen}

\begin{document}

\maketitle

\abstract{\noindent The following is an example of a table of systematics for the pendulum experiment for measuring the local gravitational acceleration $g$.}

\begin{table}[htbp!]
  \centering
  \begin{tabular}{lrrr}
    \hline
    \hline
    Variable           &Value           &Uncertainty      &Impact on $g$\\
    \hline
    Period $T$         &8.456 s         &0.004 s          &0.03 m/$\mbox{s}^2$\\
    Length $l$         &14.104 m        &0.004 m          &0.04 m/$\mbox{s}^2$\\
    Systematic 1       &20 C            &1 C              &? m/$\mbox{s}^2$\\
    \hline
    Resulting $g$      &9.84 m/$\mbox{s}^2$  &            &0.05 m/$\mbox{s}^2$\\
    \hline
    \hline
  \end{tabular}
  \caption{Table of systematic uncertainties affecting the measurement of $g$. Note that the values quoted are pure fiction! \label{tab:g_systematics}}
\end{table}

\end{document}
