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Table 3

Best-fit parameters obtained for the L1551 IRS 5 northern disk using two different approaches.

Species nlines Eup (K) N (cm−2) Tex (K) FWHM (km s−1) vLSR (km s1) s (″)
COMs with free parameters

CH3OH 18 56–946 (1.720.08+0.08)×1019${\left( {1.72_{ - 0.08}^{ + 0.08}} \right) \times {{10}^{19}}}$ 294.904.40+3.41${294.90_{ - 4.40}^{ + 3.41}}$ 1.970.03+0.03${1.97_{ - 0.03}^{ + 0.03}}$ 9.590.01+0.02${9.59_{ - 0.01}^{ + 0.02}}$ 0.050.01+0.01${0.05_{ - 0.01}^{ + 0.01}}$
CH3OHa 7 657–946 (1.110.12+0.17)×1020${\left( {1.11_{ - 0.12}^{ + 0.17}} \right) \times {{10}^{20}}}$ 140.304.60+3.90${140.30_{ - 4.60}^{ + 3.90}}$ 1.920.04+0.06${1.92_{ - 0.04}^{ + 0.06}}$ 9.770.03+0.03${9.77_{ - 0.03}^{ + 0.03}}$ 0.050.01+0.01${0.05_{ - 0.01}^{ + 0.01}}$
13CH3OH 3 162–254 (1.220.10+0.25)×1017${\left( {1.22_{ - 0.10}^{ + 0.25}} \right) \times {{10}^{17}}}$ 128.4013.00+9.20${128.40_{ - 13.00}^{ + 9.20}}$ 1.980.09+0.12${1.98_{ - 0.09}^{ + 0.12}}$ 9.720.04+0.04${9.72_{ - 0.04}^{ + 0.04}}$ 0.250.06+0.03${0.25_{ - 0.06}^{ + 0.03}}$
CH318OH 9 33–96 (1.120.10+0.16)×1016${\left( {1.12_{ - 0.10}^{ + 0.16}} \right) \times {{10}^{16}}}$ 91.318.76+7.98${91.31_{ - 8.76}^{ + 7.98}}$ 2.560.16+0.21${2.56_{ - 0.16}^{ + 0.21}}$ 9.750.05+0.05${9.75_{ - 0.05}^{ + 0.05}}$ 0.420.04+0.04${0.42_{ - 0.04}^{ + 0.04}}$
CH2DOH 9 49–352 (6.570.54+0.57)×1018${\left( {6.57_{ - 0.54}^{ + 0.57}} \right) \times {{10}^{18}}}$ 145.605.30+4.90${145.60_{ - 5.30}^{ + 4.90}}$ 1.940.13+0.13${1.94_{ - 0.13}^{ + 0.13}}$ 10.060.06+0.06${10.06_{ - 0.06}^{ + 0.06}}$ 0.050.01+0.01${0.05_{ - 0.01}^{ + 0.01}}$
CH2DOHb 6 49–352 (5.250.72+0.90)×1018${\left( {5.25_{ - 0.72}^{ + 0.90}} \right) \times {{10}^{18}}}$ 210.3012.50+24.70${210.30_{ - 12.50}^{ + 24.70}}$ 1.780.04+0.05${1.78_{ - 0.04}^{ + 0.05}}$ 9.980.02+0.03${9.98_{ - 0.02}^{ + 0.03}}$ 0.060.01+0.01${0.06_{ - 0.01}^{ + 0.01}}$
CH3CHO 27 6 –387 (1.120.15+0.23)×1017$\left( {1.12_{ - 0.15}^{ + 0.23}} \right) \times {10^{17}}$ 212.306.30+8.40$212.30_{ - 6.30}^{ + 8.40}$ 2.280.05+0.06$2.28_{ - 0.05}^{ + 0.06}$ 9.800.02+0.02$9.80_{ - 0.02}^{ + 0.02}$ 0.070.01+0.01$0.07_{ - 0.01}^{ + 0.01}$
CH3OCH3 8 81–253 (9.570.51+0.65)×1016$\left( {9.57_{ - 0.51}^{ + 0.65}} \right) \times {10^{16}}$ 184.605.90+6.20$184.60_{ - 5.90}^{ + 6.20}$ 2.590.06+0.06$2.59_{ - 0.06}^{ + 0.06}$ 9.310.03+0.03$9.31_{ - 0.03}^{ + 0.03}$ 0.260.01+0.01$0.26_{ - 0.01}^{ + 0.01}$
CH3OCHO 34 106–412 (3.580.22+0.30)×1017${\left( {3.58_{ - 0.22}^{ + 0.30}} \right) \times {{10}^{17}}}$ 162.508.48+5.40${162.50_{ - 8.48}^{ + 5.40}}$ 2.110.04+0.05${2.11_{ - 0.04}^{ + 0.05}}$ 9.550.02+0.02${9.55_{ - 0.02}^{ + 0.02}}$ 0.090.01+0.01${0.09_{ - 0.01}^{ + 0.01}}$
CH3COCH3 13 111–116 (6.553.35+5.46)×1016${\left( {6.55_{ - 3.35}^{ + 5.46}} \right) \times {{10}^{16}}}$ 104.6010.40+10.10${104.60_{ - 10.40}^{ + 10.10}}$ 2.380.22+0.26${2.38_{ - 0.22}^{ + 0.26}}$ 9.600.08+0.07${9.60_{ - 0.08}^{ + 0.07}}$ 0.050.01+0.02${0.05_{ - 0.01}^{ + 0.02}}$
C2H5OH 24 24–464 (5.242.04+1.52)×1017$\left( {5.24_{ - 2.04}^{ + 1.52}} \right) \times {10^{17}}$ 190.7023.30+19.60$190.70_{ - 23.30}^{ + 19.60}$ 2.230.10+0.09$2.23_{ - 0.10}^{ + 0.09}$ 9.950.03+0.03$9.95_{ - 0.03}^{ + 0.03}$ 0.070.01+0.02$0.07_{ - 0.01}^{ + 0.02}$
C2H5CN 20 147–368 (2.430.07+0.07)×1015$\left( {2.43_{ - 0.07}^{ + 0.07}} \right) \times {10^{15}}$ 190.605.20+5.30$190.60_{ - 5.20}^{ + 5.30}$ 2.480.08+0.07$2.48_{ - 0.08}^{ + 0.07}$ 9.740.03+0.03$9.74_{ - 0.03}^{ + 0.03}$ 0.420.02+0.02$0.42_{ - 0.02}^{ + 0.02}$
13CH3CN 5 78–257 (4.711.30+1.73)×1015$\left( {4.71_{ - 1.30}^{ + 1.73}} \right) \times {10^{15}}$ 170.6018.59+15.50$170.60_{ - 18.59}^{ + 15.50}$ 2.110.09+0.11$2.11_{ - 0.09}^{ + 0.11}$ 9.620.04+0.03$9.62_{ - 0.04}^{ + 0.03}$ 0.060.01+0.01$0.06_{ - 0.01}^{ + 0.01}$
CH3C15N 3 78–335 (4.640.78+0.95)×1014$\left( {4.64_{ - 0.78}^{ + 0.95}} \right) \times {10^{14}}$ 242.5535.53+37.25$242.55_{ - 35.53}^{ + 37.25}$ 2.770.38+0.83$2.77_{ - 0.38}^{ + 0.83}$ 9.270.18+0.17$9.27_{ - 0.18}^{ + 0.17}$ 0.430.12+0.04$0.43_{ - 0.12}^{ + 0.04}$

COMs with Tex = 177.6K, FWHM = 2.17km s−1, vLSR = 9.67 km s−1 and s = 0.08″

CH3OH 18 56–946 (4.660.18+0.16)×1018$\left( {4.66_{ - 0.18}^{ + 0.16}} \right) \times {10^{18}}$
CH3OHa 7 657–946 (1.600.07+0.06)×1019$\left( {1.60_{ - 0.07}^{ + 0.06}} \right) \times {10^{19}}$
13CH3OH 3 162–254 (4.970.27+0.30)×1017$\left( {4.97_{ - 0.27}^{ + 0.30}} \right) \times {10^{17}}$
CH318OH 9 33–96 (9.940.49+0.49)×1016$\left( {9.94_{ - 0.49}^{ + 0.49}} \right) \times {10^{16}}$
CH2DOH 9 49–352 (1.080.06+0.07)×1018$\left( {1.08_{ - 0.06}^{ + 0.07}} \right) \times {10^{18}}$
CH2DOHb 6 49–352 (2.810.17+0.19)×1018$\left( {2.81_{ - 0.17}^{ + 0.19}} \right) \times {10^{18}}$
CH3CHO 27 65–387 (8.040.17+0.18)×1016$\left( {8.04_{ - 0.17}^{ + 0.18}} \right) \times {10^{16}}$
CH3OCH3 8 81–253 (3.410.10+0.11)×1017$\left( {3.41_{ - 0.10}^{ + 0.11}} \right) \times {10^{17}}$
CH3OCHO 34 106–412 (5.050.11+0.11)×1017$\left( {5.05_{ - 0.11}^{ + 0.11}} \right) \times {10^{17}}$
CH3COCH3 13 111–116 (1.100.07+0.07)×1017$\left( {1.10_{ - 0.07}^{ + 0.07}} \right) \times {10^{17}}$
C2H5OH 24 24–464 (3.390.12+0.12)×1017$\left( {3.39_{ - 0.12}^{ + 0.12}} \right) \times {10^{17}}$
C2H5CN 20 147–368 (8.840.23+0.22)×1015$\left( {8.84_{ - 0.23}^{ + 0.22}} \right) \times {10^{15}}$
13CH3CN 5 78–257 (2.730.12+0.11)×1015$\left( {2.73_{ - 0.12}^{ + 0.11}} \right) \times {10^{15}}$
CH3C15N 3 78–335 (1.150.15+0.16)×1015$\left( {1.15_{ - 0.15}^{ + 0.16}} \right) \times {10^{15}}$

Notes. The top part of the table shows the results from the runs with all parameters left free, and the bottom part when fixing the Tex, FWHM, vLSR, and s to the median values obtained from the all-free runs. The uncertainties listed in each column only represent the statistical uncertainties from the fitting procedure. For CH3 OH we include the results obtained using only the high excitation lines (flagged with a), and for CH2DOH we include the results obtained using only the lines with the lowest opacities (flagged with b). The second and third columns are the number of transitions used in the fit and their Eup range.

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