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\begin{document}
\small
\begin{tabular}{l|c|c|c}
Source of uncertainty & $M(D^{0})$ & $M(D^{+}) - M(D^{0})$ & $M(D^{+}_s) - M(D^{+})$ \\
\hline
 Momentum scale                  & \phantom{$<$}0.09  & \phantom{$<$}0.04 & \phantom{$<$}0.04 \\
Energy loss correction              & \phantom{$<$}0.03  & \phantom{$<$}0.06 & $<$0.01  \\
$K^{\pm}$ mass                 & \phantom{$<$}0.05 & $<$0.01  & $<$0.01   \\
Signal model                            & \phantom{$<$}0.02  & $<$0.01 & $<$0.01  \\
Background model                        & $<$0.01 & $<$0.01 & $<$0.01  \\
\hline
Quadratic sum                           & \phantom{$<$}0.11 & \phantom{$<$}0.07 & \phantom{$<$}0.04  \\
\end{tabular}
\end{document}
