\begin{table}%t1 \caption{\label{tabobs}Log of H$_2$O observations and production rates in comet C/2001~Q4 (NEAT) (average of AC1 and AC2+AOS data until 13 April).} %\centering \small \begin{tabular}{rccrlccr} \hline\hline\noalign{\smallskip} UT date & $\langle r_{h}\rangle$ & $\langle \Delta\rangle$ & Int. time & $\int T_b{\rm d}v^*$ & Velocity offset & Offset & $Q_{\rm app H_2O}$ \\[0cm] [mm/dd.ddd] & [AU] & [AU] & [min] & [K~km~s$^{-1}$] & [km~s$^{-1}$] & [\arcsec] & [$10^{28}$~\mols] \\ \hline 2004/03/06.552 & 1.519 & 1.734 & 2 & $1.99\pm0.54$ & $-0.18\pm0.30$ & 51 & $17.90\pm5.54$ \\ 06.571 & & & 28 & $2.61\pm0.16$ & $-0.01\pm0.06$ & 17 & $17.77\pm1.32$ \\ 06.631 & & 1.733 & 96 & $2.66\pm0.12$ & $+0.07\pm0.04$ & 17 & $18.13\pm0.97$ \\ 2004/03/15.595 & 1.413 & 1.535 & 2 & $2.11\pm0.48$ & $+0.46\pm0.25$ & 63 & $17.95\pm4.81$ \\ 15.611 & & & 30 & $2.94\pm0.16$ & $+0.03\pm0.07$ & 18 & $16.09\pm1.12$ \\ 15.656 & 1.412 & 1.534 & 7 & $3.12\pm0.32$ & $+0.27\pm0.10$ & 9 & $16.71\pm2.12$ \\ 15.671 & & & 90 & $3.01\pm0.10$ & $+0.20\pm0.04$ & 18 & $16.58\pm0.70$ \\ 2004/03/24.522 & 1.312 & 1.321 & 30 & $3.96\pm0.20$ & $+0.14\pm0.06$ & 20 & $17.93\pm1.15$ \\ 24.528 & & & 8 & $4.19\pm0.31$ & $+0.06\pm0.08$ & 17 & $19.19\pm1.78$ \\ 24.560 & & 1.320 & 3 & $2.43\pm0.52$ & $-0.23\pm0.24$ & 69 & $17.78\pm4.64$ \\ 24.581 & 1.311 & 1.319 & 93 & $3.77\pm0.10$ & $+0.22\pm0.03$ & 19 & $16.70\pm0.58$ \\ 24.650 & & & 100 & $3.87\pm0.10$ & $+0.16\pm0.03$ & 19 & $17.29\pm0.60$ \\ 2004/04/02.559 & 1.217 & 1.089 & 31 & $5.37\pm0.17$ & $+0.24\pm0.04$ & 24 & $18.52\pm0.79$ \\ 02.568 & 1.216 & 1.088 & 16 & $5.80\pm0.24$ & $+0.23\pm0.05$ & 33 & $21.99\pm1.20$ \\ 02.608 & & & 20 & $6.78\pm0.23$ & $+0.20\pm0.04$ & 21 & $24.71\pm1.15$ \\ 02.615 & & 1.087 & 17 & $5.55\pm0.25$ & $+0.23\pm0.05$ & 25 & $19.44\pm1.16$ \\ 02.625 & & & 31 & $6.09\pm0.18$ & $+0.14\pm0.04$ & 24 & $21.79\pm0.85$ \\ 02.635 & & & 14 & $5.04\pm0.26$ & $+0.27\pm0.06$ & 24 & $16.98\pm1.16$ \\ 02.643 & & 1.086 & 19 & $4.44\pm0.22$ & $-0.04\pm0.06$ & 29 & $14.92\pm0.97$ \\ 02.692 & 1.215 & 1.085 & 8 & $5.13\pm0.38$ & $+0.19\pm0.08$ & 23 & $17.19\pm1.67$ \\ 2004/04/13.536 & 1.114 & 0.792 & 15 & $11.33\pm0.27$ & $+0.14\pm0.03$ & 29 & $29.12\pm0.98$ \\ 13.541 & & & 15 & $10.41\pm0.27$ & $+0.12\pm0.03$ & 39 & $28.33\pm1.06$ \\ 13.594 & 1.113 & 0.791 & 8 & $12.46\pm0.41$ & $+0.25\pm0.05$ & 17 & $30.81\pm1.47$ \\ 13.607 & & & 80 & $10.14\pm0.11$ & $+0.11\pm0.01$ & 21 & $23.39\pm0.35$ \\ 13.611 & & & 32 & $9.94\pm0.18$ & $+0.11\pm0.02$ & 21 & $22.77\pm0.57$ \\ 13.629 & & 0.790 & 21 & $9.01\pm0.23$ & $+0.15\pm0.03$ & 31 & $21.42\pm0.76$ \\ 13.672 & & 0.789 & 21 & $8.68\pm0.23$ & $+0.18\pm0.03$ & 36 & $21.24\pm0.78$ \\ 13.679 & & & 68 & $5.51\pm0.11$ & $+0.18\pm0.03$ & 73 & $19.17\pm0.42$ \\ 13.688 & & 0.788 & 9 & $3.32\pm0.35$ & $+0.35\pm0.14$ &107 & $19.10\pm2.49$ \\ 2004/04/26.682 & 1.019 & 0.454 & 38 & $18.87\pm0.21$ & $+0.15\pm0.02$ & 30 & $23.68\pm0.40$ \\ 26.745 & 1.019 & 0.452 & 48 & $19.14\pm0.17$ & $+0.16\pm0.02$ & 32 & $24.45\pm0.34$ \\ 26.811 & 1.018 & 0.451 & 48 & $18.43\pm0.15$ & $+0.16\pm0.02$ & 31 & $22.75\pm0.30$ \\ 26.878 & 1.018 & 0.449 & 48 & $18.88\pm0.16$ & $+0.14\pm0.02$ & 30 & $23.25\pm0.32$ \\ 26.947 & 1.018 & 0.448 & 48 & $19.66\pm0.16$ & $+0.17\pm0.01$ & 29 & $24.52\pm0.31$ \\ 27.012 & 1.017 & 0.446 & 48 & $19.60\pm0.17$ & $+0.15\pm0.02$ & 27 & $23.71\pm0.33$ \\ 27.080 & 1.017 & 0.445 & 48 & $19.68\pm0.15$ & $+0.18\pm0.01$ & 29 & $24.12\pm0.28$ \\ 27.138 & 1.017 & 0.444 & 30 & $21.70\pm0.28$ & $+0.19\pm0.02$ & 27 & $27.61\pm0.57$ \\ 27.214 & 1.016 & 0.442 & 48 & $21.00\pm0.13$ & $+0.16\pm0.01$ & 29 & $26.53\pm0.26$ \\ 27.259 & 1.016 & 0.441 & 0.3 & $18.55\pm1.40$ & $+0.13\pm0.10$ & 50 & $26.97\pm3.05$ \\ 27.395 & 1.015 & 0.438 & 1 & $15.97\pm0.98$ & $+0.19\pm0.11$ & 47 & $20.54\pm1.90$ \\ 2004/04/29.962 & 1.002 & 0.388 & 49 & $22.17\pm0.19$ & $+0.12\pm0.02$ & 45 & $26.87\pm0.35$ \\ 30.029 & 1.002 & 0.386 & 49 & $21.33\pm0.17$ & $+0.14\pm0.02$ & 45 & $25.12\pm0.32$ \\ 30.096 & 1.001 & 0.385 & 49 & $20.64\pm0.17$ & $+0.11\pm0.02$ & 44 & $23.46\pm0.30$ \\ 30.163 & 1.001 & 0.384 & 49 & $21.24\pm0.17$ & $+0.15\pm0.01$ & 41 & $23.64\pm0.30$ \\ 30.230 & 1.000 & 0.383 & 49 & $21.34\pm0.16$ & $+0.14\pm0.01$ & 42 & $23.97\pm0.28$ \\ 30.297 & 1.000 & 0.381 & 49 & $20.84\pm0.17$ & $+0.13\pm0.02$ & 42 & $22.87\pm0.30$ \\ 30.364 & 1.000 & 0.380 & 48 & $22.43\pm0.16$ & $+0.19\pm0.01$ & 46 & $26.75\pm0.32$ \\ 30.431 & 1.000 & 0.379 & 48 & $23.07\pm0.16$ & $+0.15\pm0.01$ & 46 & $27.89\pm0.33$ \\ 30.498 & 0.999 & 0.378 & 48 & $25.52\pm0.18$ & $+0.19\pm0.01$ & 45 & $32.32\pm0.37$ \\ 2004/05/01.617 & 0.994 & 0.359 & 2 & $6.27\pm0.76$ & $+0.23\pm0.21$ &168 & $25.22\pm3.86$ \\ 01.704 & 0.994 & 0.359 & 45 & $22.66\pm0.19$ & $+0.15\pm0.02$ & 50 & $25.99\pm0.35$ \\ 01.771 & 0.994 & 0.358 & 46 & $22.11\pm0.19$ & $+0.18\pm0.02$ & 50 & $24.92\pm0.35$ \\ 01.838 & 0.993 & 0.357 & 46 & $22.23\pm0.19$ & $+0.21\pm0.02$ & 51 & $25.32\pm0.36$ \\ 01.905 & 0.993 & 0.356 & 46 & $21.68\pm0.18$ & $+0.16\pm0.02$ & 51 & $24.22\pm0.32$ \\ 01.970 & 0.993 & 0.355 & 42 & $22.29\pm0.19$ & $+0.18\pm0.02$ & 52 & $25.52\pm0.35$ \\ 02.039 & 0.992 & 0.354 & 46 & $23.43\pm0.19$ & $+0.15\pm0.02$ & 52 & $27.47\pm0.36$ \\ 02.106 & 0.992 & 0.353 & 46 & $25.64\pm0.18$ & $+0.14\pm0.01$ & 53 & $32.03\pm0.37$ \\ 02.173 & 0.992 & 0.353 & 46 & $26.55\pm0.21$ & $+0.12\pm0.01$ & 54 & $34.45\pm0.45$ \\ 02.240 & 0.992 & 0.352 & 46 & $26.12\pm0.18$ & $+0.15\pm0.01$ & 53 & $32.93\pm0.38$ \\ 02.307 & 0.991 & 0.351 & 46 & $25.23\pm0.19$ & $+0.13\pm0.01$ & 52 & $30.52\pm0.38$ \\ 02.374 & 0.991 & 0.350 & 45 & $23.72\pm0.18$ & $+0.11\pm0.01$ & 53 & $27.84\pm0.36$ \\ 02.442 & 0.991 & 0.349 & 49 & $23.48\pm0.17$ & $+0.15\pm0.01$ & 48 & $25.66\pm0.31$ \\ 02.510 & 0.990 & 0.348 & 50 & $22.21\pm0.16$ & $+0.14\pm0.01$ & 49 & $23.60\pm0.27$ \\ 02.556 & 0.990 & 0.348 & 0.3 & $22.72\pm1.61$ & $+0.22\pm0.10$ & 54 & $26.04\pm2.94$ \\ 02.715 & 0.990 & 0.346 & 25 & $21.39\pm0.20$ & $+0.19\pm0.02$ & 50 & $22.31\pm0.34$ \\ \hline \end{tabular} \begin{tabular}{rccrlccr} \multicolumn{8}{c}{Log of H$_2$O observations and production rates in comet C/2001~Q4 (NEAT) (AOS data only after 13 April) -- cont.} \\ \hline\hline\noalign{\smallskip} UT date & $\langle r_{h}\rangle$ & $\langle\Delta\rangle$ & Int. time & $\int T_b{\rm d}v^*$ & Velocity offset & Offset & $Q_{\rm appH_2O}$ \\[0cm] [mm/dd.ddd] & [AU] & [AU] & [min] & [K~km~s$^{-1}$] & [km~s$^{-1}$] & [\arcsec] & [$10^{28}$~\mols] \\ \hline 02.778 & 0.989 & 0.345 & 50 & $23.52\pm0.15$ & $+0.13\pm0.01$ & 50 & $25.81\pm0.27$ \\ 02.845 & 0.989 & 0.344 & 49 & $24.56\pm0.16$ & $+0.15\pm0.01$ & 51 & $27.90\pm0.30$ \\ 02.896 & 0.989 & 0.344 & 10 & $24.44\pm0.37$ & $+0.21\pm0.03$ & 54 & $28.80\pm0.71$ \\ 2004/05/15.858 & 0.962 & 0.432 & 13 & $7.07\pm0.26$ & $+0.00\pm0.05$ & 140 & $29.25\pm1.51$ \\ 15.919 & & 0.434 & 13 & $8.42\pm0.30$ & $+0.14\pm0.05$ & 121 & $23.64\pm0.87$ \\ 15.923 & & 0.434 & 13 & $13.13\pm0.34$ & $+0.03\pm0.04$ & 78 & $26.97\pm1.27$ \\ 15.986 & & 0.435 & 5 & $19.05\pm0.56$ & $+0.13\pm0.05$ & 23 & $21.10\pm0.99$ \\ 15.986 & & 0.435 & 15 & $13.40\pm0.23$ & $+0.15\pm0.02$ & 65 & $19.84\pm0.51$ \\ 15.986 & & 0.435 & 12 & $4.95\pm0.45$ & $+0.07\pm0.08$ & 123 & $14.20\pm1.42$ \\ 16.056 & & 0.437 & 25 & $7.13\pm0.18$ & $+0.11\pm0.03$ & 122 & $22.25\pm0.75$ \\ 16.057 & & 0.437 & 13 & $16.05\pm0.37$ & $+0.04\pm0.04$ & 62 & $24.95\pm0.86$ \\ 16.120 & & 0.439 & 20 & $7.03\pm0.29$ & $+0.06\pm0.06$ & 126 & $22.84\pm1.22$ \\ 2004/05/15.76-16.26&0.962& 0.436& 120 & $3.50\pm0.10$ & $+0.03\pm0.04$ & 184 & $24.45\pm0.81$ \\ & & 0.436 & 83 & $1.29\pm0.11$ & $+0.11\pm0.08$ & 231 & $15.36\pm1.40$ \\ 2004/05/16.241 & 0.962 & 0.441 & 11 & $14.12\pm0.32$ & $+0.20\pm0.03$ & 22 & $13.72\pm0.46$ \\ 16.244 & 0.962 & 0.441 & 21 & $16.56\pm0.19$ & $+0.11\pm0.01$ & 23 & $17.42\pm0.31$ \\ \hline \end{tabular} \par \medskip $^*$ Line intensity corrected for beam losses (converted into main beam brightness temperature) and integrated over its width. \end{table}