\begin{table}%t3
\caption{\label{tab3}Top-level systematic error budget (peak-to-peak values).}
%\centering
\par
\begin{tabular}{lccc}
\hline\hline\noalign{\smallskip}
 &Random\tablefootmark{a} & Spin synch&Periodic\tablefootmark{a} \\
Source  & $\delta T$ fraction & [$\mu$K] & [$\mu$K] \\
\hline
External straylight \dotfill &$\ldots$&1&$\ldots$ \\
Internal straylight \dotfill &0.045&1&0.9 \\
4~K load \dotfill          &0.025&1&0.6~(11) \\
Thermal fluctuations \dotfill &0.03&0.8&1.1~(11) \\
Front end $1/f$ \dotfill    &0.25~(0.34)&$\ldots$&$\ldots$ \\
Back end $1/f$ \dotfill     &0.35~(0.48)&$\ldots$&$\ldots$ \\
DC electronics  \dotfill    &0.04&$\ldots$&$\ldots$ \\
Quantisation \dotfill       &0.01&$\ldots$&$\ldots$ \\
 \dotfill&&& \\
\bf Total  \dotfill         &\bf 0.44&\bf1.9&\bf 1.5 \\
Noise increase \dotfill&1.091 \\
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{For $1/f$ and thermal periodic fluctuations the allocated limits are residuals after consolidated software removal techniques are applied to the data (numbers in parenthesis give the effect before removal).}}
\end{table}