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\begin{document}
\small
\begin{tabular}{l|c}
Source &  Uncertainty [fs] \\
\hline
Simulated sample sizes &  5.2 \\
$A_{\rm VELO}$   & 1.1 \\
$A_{\rm DLS}$ & -- \\
$A_{\rm IP\chi^2\xspace}$  & 0.4 \\
$A_{\rm MVA}$ &  1.7 \\
$ B\xspace\xspace^+\xspace$ lifetime & 4.0 \\
Time resolution model & 0.3 \\
VELO half alignment & 3.8 \\
$\tau$ for $ B\xspace\xspace^0_ s\xspace\xspace\xspace \rightarrow \chi_c \eta$ component & 0.7  \\
Mass model & 0.8 \\
$ B\xspace\xspace^0\xspace$ component & 0.4 \\
Momentum scale   &  --  \\
$z$-scale         & 0.3 \\
Data-simulation  $\chi^2_{\text{IP}}$ \xspace differences & 0.1 \\
Mass-time correlation & 0.5
\\
$ B\xspace\xspace_ c\xspace\xspace^+\xspace$ component & 1.0 \\
\hline
Quadrature sum & 8.0 \\
\end{tabular}
\end{document}
