\begin{table}%t1 \caption{\label{mnn}Mean and median Nearest Neighbour (NN) radii for protostars (all sources, sources with H$_2$~outflows, and sources without) in Orion~A. The standard deviation (std) is given in brackets. North and South refer to protostars located north or south of declination~$-$6\dg, respectively.} %\centering \small \begin{tabular}{@{}l ccccc@{}} \hline\hline Region & 5th NN & 6th NN & 7th NN & 10th NN & 20th NN \\ & mean(std)median & mean(std)median & mean(std)median & mean(std)median & mean(std)median \\ \hline All Protostars & 0.087\dg(0.09\dg)0.060\dg & 0.097\dg(0.10\dg)0.070\dg & 0.106\dg(0.10\dg)0.079\dg & 0.13\dg(0.11\dg)0.11\dg & 0.20\dg(0.11\dg)0.18\dg \\ Protostars with flow & 0.077\dg(0.06\dg)0.064\dg & 0.089\dg(0.07\dg)0.085\dg & 0.098\dg(0.07\dg)0.096\dg & 0.13\dg(0.08\dg)0.12\dg & 0.19\dg(0.10\dg)0.20\dg \\ Protostars no flow & 0.090\dg(0.10\dg)0.055\dg & 0.100\dg(0.11\dg)0.061\dg & 0.109\dg(0.11\dg)0.073\dg & 0.13\dg(0.12\dg)0.09\dg & 0.20\dg(0.12\dg)0.17\dg \\ \\ All Protostars (North) & 0.077\dg(0.08\dg)0.042\dg & 0.086\dg(0.09\dg)0.050\dg & 0.095\dg(0.10\dg)0.058\dg & 0.12\dg(0.11\dg)0.08\dg & 0.16\dg(0.12\dg)0.14\dg \\ Protostars with flow (North) & 0.059\dg(0.06\dg)0.035\dg & 0.068\dg(0.06\dg)0.048\dg & 0.075\dg(0.07\dg)0.058\dg & 0.10\dg(0.08\dg)0.11\dg & 0.14\dg(0.10\dg)0.14\dg \\ Protostars no flow (North) & 0.083\dg(0.09\dg)0.047\dg & 0.093\dg(0.10\dg)0.051\dg & 0.103\dg(0.11\dg)0.059\dg & 0.12\dg(0.12\dg)0.08\dg & 0.17\dg(0.13\dg)0.13\dg \\ \\ All Protostars (South) & 0.096\dg(0.10\dg)0.075\dg & 0.107\dg(0.10\dg)0.094\dg & 0.115\dg(0.10\dg)0.101\dg & 0.14\dg(0.11\dg)0.12\dg & 0.23\dg(0.11\dg)0.21\dg \\ Protostars with flow (South) & 0.094\dg(0.06\dg)0.093\dg & 0.110\dg(0.06\dg)0.120\dg & 0.119\dg(0.06\dg)0.137\dg & 0.16\dg(0.07\dg)0.18\dg & 0.24\dg(0.06\dg)0.23\dg \\ Protostars no flow (South) & 0.097\dg(0.11\dg)0.073\dg & 0.106\dg(0.11\dg)0.079\dg & 0.114\dg(0.11\dg)0.083\dg & 0.14\dg(0.12\dg)0.11\dg & 0.23\dg(0.12\dg)0.19\dg \\ \hline \end{tabular} \end{table}