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Table 5

Detected lines of 13C-HCOOCH3vt = 1 towards Orion KL.

Spec. J K a K c p J ′ p ′ Calc. freq. E u S ij μ 2 Obs. freq. v LSR Blend
(MHz) (K) (D2) (MHz) (km s-1) (K) (K)
A-13C1 12 1 12 + 11 1 11 + 130 348.229 229.4 32.1 130 349.3 4.6±1.2 0.06 0.03
E-13C1 12 –1 12 11 –1 11 130 424.730 229.5 32.2 130 424.3 8.1±1.2 0.04 0.03
A-13C2 11 3 9 + 10 3 8 + 130 674.060 231.2 26.8 130 673.6 8.0±1.1 0.07 0.03 CH3CH2C15N
E-13C2 11 5 6 10 5 5 131 497.371 340.9 23.2 131 497.9 5.7±1.1 0.03 0.02
E-13C2 11 –3 9 10 –3 8 131 600.450 329.8 26.6 131 600.6 6.6±1.1 0.03 0.02
A-13C2 11 4 8 – 10 4 7 – 131 626.157 235.9 25.2 131 626.6 6.0±1.1 0.07 0.02 (CH3)2CO
A-13C2 11 4 7 + 10 4 6 + 132 401.079 236.0 25.2 132 400.5 8.3±1.1 0.04 0.02 CH3CHDCN
A-13C1 11 3 9 + 10 3 8 + 132 807.823 231.8 27.4 132 806.7 9.6±1.1 0.07 0.03
A-13C1 11 9 2 – 10 9 1 – 132 945.107 279.3 9.86 132 946.6 3.7±1.1 0.07 0.02 CCCS
A-13C1 11 9 3 + 10 9 2 + 132 945.107 279.3 9.86 † 3.7±1.1
E-13C2 11 3 8 10 3 7 136 042.486 330.6 26.8 136 042.9 6.2±1.1 0.03 0.03
E-13C1 11 3 8 10 3 7 138 640.538 232.8 27.6 138 640.6 6.9±1.1 0.04 0.03
A-13C2 13 1 13 + 12 1 12 + 138 830.565 235.5 34.0 138 829.7 8.9±1.1 0.06 0.04
E-13C1 12 –2 11 11 –2 10 139 241.862 234.5 31.5 139 239.2 12.6±1.1 0.06 0.03 CH2DCH2CN
E-13C1 13 –1 13 12 –1 12 140 917.742 236.2 35.0 140 918.6 5.3±1.1 0.04 0.04
A-13C1 13 0 13 + 12 0 12 + 140 937.135 236.2 34.8 140 937.6 6.1±1.1 0.13 0.04 CH2DOH
E-13C1 13 0 13 12 0 12 141 008.471 236.2 35.0 141 007.8 8.3±1.1 0.09 0.04
E-13C1 12 1 11 11 1 10 141 542.530 234.2 31.6 141 543.0 6.1±1.1 0.05 0.04
A-13C2 12 3 10 + 11 3 9 + 142 240.894 238.0 29.5 142 240.3 8.2±1.1 0.04 0.03
E-13C2 12 4 8 11 4 7 144 894.428 341.8 28.2 144 895.6 4.6±1.0 0.06 0.03
E-13C2 12 –4 9 11 –4 8 144 984.322 341.4 28.2 144 983.7 8.4±1.0 0.05 0.03
E-13C1 12 7 5 11 7 4 145 262.992 266.0 21.5 145 262.9 7.1±1.0 0.07 0.02 U
A-13C1 12 7 6 + 11 7 5 + 145 282.393 265.1 21.5 145 282.9 5.9±1.0 0.07 0.04
A-13C1 12 7 5 – 11 7 4 – 145 282.519 265.1 21.5 † 6.2±1.0
E-13C1 12 5 7 11 5 6 146 170.669 250.0 27.0 146 170.3 7.7±1.0 0.15 0.03 H13COOCH3
E-13C1 12 4 8 11 4 7 147 500.782 244.1 28.9 147 501.6 5.4±1.0 0.15 0.07
E-13C1 12 –4 9 11 –4 8 147 501.246 243.7 28.7 † 6.3±1.0
A-13C1 13 2 12 – 12 2 11 – 149 734.053 241.5 34.0 149 734.5 6.0±1.0 0.05 0.04
A-13C1 12 2 10 + 11 2 9 + 150 951.028 237.3 31.4 150 950.6 7.9±1.0 0.04 0.04
E-13C1 14 0 14 13 –1 13 151 328.687 243.5 6.07 151 331.6 1.3±1.0 0.11 0.05 U
A-13C1 14 1 14 + 13 1 13 + 151 329.124 243.4 37.5 † 2.2±1.0
E-13C1 14 0 14 13 0 13 151 452.158 243.5 37.7 151 451.6 8.1±1.0 0.04 0.05
E-13C2 13 –3 11 12 –3 10 154 267.593 344.1 32.4 154 267.7 6.8±1.0 0.08 0.04 CH3CHO
A-13C2 13 7 7 + 12 7 6 + 154 902.510 272.0 24.4 154 902.4 7.2±1.0 0.24 0.05 SO2ν2 = 1
A-13C2 13 7 6 – 12 7 5 – 154 902.822 272.0 24.4 † 7.8±1.0
A-13C1 13 3 11 + 12 3 10 + 156 106.621 246.2 33.2 156 107.9 4.6±1.0 0.15 0.04 HCOOCH3νt = 1
E-13C1 13 –3 11 12 –3 10 156 705.635 246.5 33.3 156 705.5 7.3±1.0 0.11 0.04 CH3CH2C15N
E-13C1 13 10 3 12 10 2 156 879.965 307.6 14.4 156 880.5 6.0±1.0 0.05 0.01
E-13C1 13 9 4 12 9 3 157 026.174 294.9 18.4 157 026.5 6.4±1.0 0.09 0.02 HCOOCH3
A-13C1 13 10 4 – 12 10 3 – 157 221.146 306.4 14.4 157 224.1 1.4±1.0 0.15 0.05 U
A-13C1 13 10 3 + 12 10 2 + 157 221.146 306.4 14.4 † 1.4±1.0
E-13C1 13 8 5 12 8 4 157 227.514 283.6 22.0 † 13.6±1.0 0.02
E-13C2 13 –4 10 12 –4 9 157 232.535 348.9 30.8 157 231.6 8.9±1.0 0.11 0.04 CH3OH
A-13C2 13 4 9 + 12 4 8 + 158 076.398 250.5 31.1 158 076.5 6.9±0.9 0.10 0.04
A-13C1 13 5 9 + 12 5 8 + 158 310.862 257.0 30.0 158 311.6 5.7±0.9 0.14 0.04 13CH3OH
E-13C2 14 –2 13 13 –2 12 158 376.417 346.9 36.1 158 376.5 6.8±0.9 0.07 0.05
E-13C1 13 –6 8 12 –6 7 158 492.862 264.3 27.8 158 492.8 7.1±0.9 0.13 0.03 U
E-13C1 13 –5 9 12 –5 8 159 175.181 257.1 30.1 159 175.2 6.9±0.9 0.10 0.04 CH3CH2OCOH
E-13C2 14 1 13 13 1 12 159 621.190 346.8 36.1 159 620.4 8.4±0.9 0.06 0.05 CH3CH2OCOH
E-13C1 13 –4 10 12 –4 9 159 907.354 251.3 31.4 159 906.5 8.6±0.9 0.10 0.04 U
E-13C1 13 3 10 12 3 9 165 795.305 248.1 33.6 165 796.4 5.1±0.9 0.15 0.05 CH3C13CH
A-13C2 14 10 4 + 13 10 3 + 166 582.134 313.8 18.1 166 581.5 8.2±0.9 0.08 0.04
A-13C2 14 10 5 – 13 10 4 – 166 582.134 313.8 18.1 † 8.2±0.9
E-13C2 14 8 6 13 8 5 166 627.702 389.3 25.0 166 627.5 7.4±0.9 0.08 0.03
A-13C2 14 6 9 – 13 6 8 – 167 331.309 271.4 30.3 167 330.3 8.9±0.9 0.12 0.04 U
A-13C2 14 6 8 + 13 6 7 + 167 355.684 271.4 30.3 167 356.5 5.6±0.9 0.10 0.04
E-13C1 14 –3 12 13 –3 11 168 050.461 254.5 36.1 168 050.1 7.7±0.9 0.07 0.05
A-13C2 14 5 9 – 13 5 8 – 168 269.790 264.3 32.1 168 270.3 6.1±0.9 0.16 0.04 HCOO13CH3
A-13C1 14 7 8 + 13 7 7 + 169 803.580 280.8 28.4 169 802.4 9.1±0.9 0.14 0.06 U
A-13C1 14 7 7 – 13 7 6 – 169 804.698 280.8 28.4 † 11.1±0.9
A-13C2 16 0 16 + 15 0 15 + 169 839.735 258.4 41.7 169 839.4 7.6±0.9 0.22 0.06 CHCH2CN
E-13C2 16 –1 16 15 –1 15 169 881.101 356.9 42.0 169 880.5 8.1±0.9 0.10 0.06
E-13C2 14 2 12 13 2 11 171 156.971 351.0 35.9 171 157.6 5.9±0.9 0.05 0.06
E-13C2 18 –2 17 17 –2 16 200 012.238 382.3 46.5 200 011.0 8.9±0.7 0.11 0.08
E-13C2 16 3 13 15 3 12 200 350.331 372.6 40.9 200 351.0 5.9±0.7 0.08 0.07
E-13C1 17 –3 15 16 –3 14 201 246.113 281.9 44.4 201 244.8 8.9±0.7 0.21 0.08 CH3CH2OH
A-13C1 16 4 12 + 15 4 11 + 202 078.548 278.5 40.7 202 078.1 7.7±0.7 0.33 0.07 U
A-13C2 17 11 7 + 16 11 6 + 202 460.334 355.2 26.1 202 460.6 6.7±0.7 0.15 0.06
A-13C2 17 11 6 – 16 11 5 – 202 460.334 355.2 26.1 † 6.7±0.7
E-13C1 16 4 12 15 4 11 202 695.684 279.0 44.4 202 695.6 7.1±0.7 0.25 0.08 U
A-13C2 17 9 8 – 16 9 7 – 202 701.664 328.6 32.4 202 701.7 6.9±0.7 0.16 0.09
A-13C2 17 9 9 + 16 9 8 + 202 701.650 328.6 32.4 † 6.9±0.7
A-13C1 18 1 17 – 17 1 16 – 202 854.699 285.1 47.6 202 854.4 7.5±0.7 0.14 0.08
E-13C1 18 1 17 17 1 16 203 103.686 285.3 47.8 203 099.3 13.5±0.7 0.04 0.09 DCOOCH3
A-13C2 17 4 14 – 16 4 13 – 203 145.664 285.9 42.2 203 146.8 5.3±0.7 0.25 0.07 SO17O
HCCC15N
A-13C1 19 1 19 + 18 1 18 + 203 678.875 287.3 51.0 203 679.3 6.4±0.7 0.16 0.09 U
A-13C1 19 0 19 + 18 0 18 + 203 682.196 287.3 51.0 203 683.2 5.6±0.7 0.10 0.09
E-13C1 19 –1 19 18 –1 18 203 734.744 287.4 51.3 203 733.1 9.5±0.7 0.14 0.09 U
E-13C1 19 0 19 18 0 18 203 737.849 287.4 51.3 † 14.0±0.7 0.09
A-13C1 17 2 15 + 16 2 14 + 203 884.346 281.3 44.4 203 884.2 7.2±0.7 0.23 0.08 HCOOCH3νt = 1
H13COOCH3
A-13C2 17 6 12 – 16 6 11 – 204 024.731 299.0 39.3 204 024.3 7.6±0.7 0.09 0.06 CH3COOCH3
A-13C1 17 10 8 – 16 10 7 – 205 972.338 342.4 30.3 205 972.2 7.2±0.7 0.39 0.12 H2CS
A-13C1 17 10 7 + 16 10 6 + 205 972.338 342.4 30.3 † 7.2±0.7
A-13C1 17 7 11 + 16 7 10 + 206 865.964 308.8 38.3 206 867.3 5.1±0.7 0.04 0.06 CH3COOCH3
A-13C1 17 6 12 – 16 6 11 – 207 553.192 300.4 40.4 207 553.6 6.5±0.7 0.14 0.07 U
A-13C2 19 2 18 – 18 2 17 – 210 097.941 293.7 48.9 210 097.2 8.0±0.7 0.18 0.09
E-13C2 19 –2 18 18 –2 17 210 345.827 392.4 49.2 210 346.0 6.8±0.7 0.18 0.09
A-13C2 20 0 20 + 19 1 19 + 211 082.205 296.0 8.83 211 087.2 0.0±0.7 0.19 0.10
A-13C2 20 1 20 + 19 1 19 + 211 085.095 296.0 52.3 † 4.1±0.7
A-13C2 20 0 20 + 19 0 19 + 211 087.344 296.0 52.3 † 7.3±0.7
A-13C2 20 1 20 + 19 0 19 + 211 090.234 296.0 8.83 † 11.4±0.7
E-13C2 20 0 20 19 –1 19 211 134.083 394.5 8.60 211 137.3 2.4±0.7 0.24 0.09 NH2CHO
E-13C2 20 –1 20 19 –1 19 211 136.716 394.5 52.6 † 6.1±0.7
A-13C2 17 3 14 – 16 3 13 – 211 372.277 284.0 43.3 211 376.0 1.8±0.7 0.16 0.08 CH2CH13CN/U
E-13C2 18 2 16 17 2 15 211 377.266 388.8 46.0 † 8.8±0.7 0.08
A-13C1 19 1 18 – 18 1 17 – 213 261.995 295.3 50.2 213 262.2 6.7±0.7 0.13 0.09
A-13C1 18 2 16 + 17 2 15 + 213 882.009 291.5 47.0 213 884.7 3.2±0.7 0.23 0.09 13CH3CH2CN
CH2CHCN ν11 = 2
E-13C1 20 0 20 19 –1 19 214 193.599 297.6 9.04 214 197.2 1.9±0.7 0.34 0.13
E-13C1 20 –1 20 19 –1 19 214 195.705 297.6 54.0 † 4.9±0.7
E-13C1 20 0 20 19 0 19 214 197.429 297.6 54.0 † 7.3±0.7
E-13C1 20 –1 20 19 0 19 214 199.535 297.6 9.04 † 10.2±0.7
A-13C2 18 10 9 – 17 10 8 – 214 572.059 351.5 32.9 214 572.2 6.8±0.7 0.27 0.09 13C17O
A-13C2 18 10 8 + 17 10 7 + 214 572.060 351.5 32.9 † 6.8±0.7
E-13C1 17 3 14 16 3 13 215 322.039 286.0 44.6 215 324.7 3.3±0.7 0.11 0.09 U
E-13C2 18 –4 15 17 –4 14 215 326.475 395.1 45.2 † 9.5±0.7 0.08
E-13C2 18 –6 13 17 –6 12 217 440.211 408.2 42.5 217 441.0 6.0±0.7 0.16 0.07
A-13C1 18 4 15 – 17 4 14 – 218 060.270 297.8 46.2 218 057.1 11.4±0.7 0.20 0.08 c-C3H2
E-13C1 18 8 10 17 8 9 218 648.438 330.1 39.3 218 647.0 8.9±0.7 0.10 0.06 U
E-13C1 18 –9 10 17 –9 9 219 017.617 340.8 36.8 219 017.2 7.6±0.7 0.10 0.06
A-13C2 19 3 17 + 18 3 16 + 219 092.328 300.8 48.4 219 092.2 7.2±0.7 0.13 0.09
E-13C2 18 5 13 17 5 12 219 883.920 401.8 43.3 219 885.9 4.3±0.7 0.13 0.08 CH2CHCN ν11 = 2
U
E-13C1 19 –3 17 18 –3 16 222 753.709 302.8 49.8 222 753.4 7.5±0.7 0.09 0.09 U
E-13C1 18 5 13 17 5 12 224 161.641 305.0 44.4 224 160.9 7.9±0.7 0.14 0.08 CH3COOCH3
E-13C2 18 4 14 17 4 13 225 917.084 397.1 45.7 225 917.1 7.0±0.7 0.14 0.09
A-13C2 19 10 10 – 18 10 9 – 226 614.150 362.4 36.4 226 614.6 6.4±0.7 0.42 0.10 CH2CHCN ν15 = 1
A-13C2 19 10 9 + 18 10 8 + 226 614.152 362.4 36.4 † 6.4±0.7
E-13C2 19 –9 11 18 –9 10 227 459.769 448.7 39.1 227 459.6 7.3±0.7 0.18 0.06
A-13C1 18 4 14 + 17 4 13 + 229 246.345 299.9 46.5 229 247.1 6.0±0.7 0.24 0.09 CH3CH2CN
E-13C2 19 6 13 18 6 12 229 294.250 419.7 45.2 229 294.6 6.5±0.7 0.30 0.08 U
E-13C2 19 –6 14 18 –6 13 229 951.441 419.2 45.2 229 952.1 6.2±0.7 0.11 0.08
E-13C1 18 4 14 17 4 13 230 063.581 300.4 46.8 230 064.6 5.7±0.7 0.21 0.10 U
A-13C1 19 14 6 – 18 14 5 – 230 100.629 427.4 23.6 230 100.8 6.8±0.7 0.15 0.14
A-13C1 19 14 5 + 18 14 4 + 230 100.629 427.4 23.6 † 6.8±0.7
E-13C2 19 –5 15 18 –5 14 230 101.552 412.2 46.0 † 8.0±0.7
A-13C1 19 9 11 + 18 9 10 + 230 720.161 351.4 40.1 230 719.6 7.7±0.7 0.15 0.12
A-13C1 19 9 10 – 18 9 9 – 230 720.299 351.4 40.1 † 7.9±0.7
A-13C2 22 0 22 + 21 1 21 + 231 708.149 317.7 9.76 231 709.6 5.2±0.6 0.22 0.21
A-13C2 22 1 22 + 21 1 21 + 231 709.053 317.7 57.7 † 6.3±0.6
A-13C2 22 0 22 + 21 0 21 + 231 709.768 317.7 57.7 † 7.3±0.6
A-13C2 22 1 22 + 21 0 21 + 231 710.673 317.7 9.76 † 8.4±0.6
A-13C1 20 2 18 + 19 2 17 + 234 053.346 313.5 52.3 234 054.0 6.2±0.6 0.29 0.10
E-13C1 22 0 22 21 –1 21 235 113.385 319.7 10.0 235 114.0 6.2±0.6 0.35 0.24
E-13C1 22 –1 22 21 –1 21 235 114.014 319.7 59.4 † 7.0±0.6
E-13C1 22 0 22 21 0 21 235 114.538 319.7 59.4 † 7.7±0.6
E-13C1 22 –1 22 21 0 21 235 115.167 319.7 10.0 † 8.5±0.6
E-13C2 20 –8 13 19 –8 12 240 214.055 449.0 44.6 240 213.9 7.2±0.6 0.24 0.07
A-13C2 22 1 21 – 21 1 20 – 241 080.593 327.0 56.9 241 082.0 5.2±0.6 0.24 0.10
E-13C1 20 –4 17 19 –4 16 241 374.048 320.9 51.9 241 373.5 7.7±0.6 0.12 0.10 CH3CH2OCOH
E-13C1 22 –2 21 21 –2 20 244 776.097 329.3 58.6 244 774.9 8.5±0.6 0.21 0.11
E-13C1 22 1 21 21 1 20 244 800.362 329.3 58.6 244 799.9 7.5±0.6 0.68 0.21 CH3CHCN
H13COOCH3
A-13C2 21 9 13 + 20 9 12 + 251 115.944 373.3 45.4 251 115.9 7.1±0.6 0.13 0.13
A-13C2 21 9 12 – 20 9 11 – 251 116.550 373.3 45.4 † 7.8±0.6
A-13C2 24 0 24 + 23 1 23 + 252 327.721 341.5 10.7 252 327.2 7.6±0.6 0.44 0.26
A-13C2 24 1 24 + 23 0 23 + 252 328.505 341.5 10.7 † 8.5±0.6
A-13C2 24 1 24 + 23 1 23 + 252 328.001 341.5 63.0 † 7.9±0.6
A-13C2 24 0 24 + 23 0 23 + 252 328.225 341.5 63.0 † 8.2±0.6
A-13C2 21 7 14 – 20 7 13 – 252 689.210 352.5 49.4 252 689.8 6.3±0.6 0.18 0.08
E-13C2 21 7 14 20 7 13 252 703.017 451.8 49.4 252 704.8 4.8±0.6 0.14 0.08 CH3COOCH3
A-13C2 21 6 16 – 20 6 15 – 253 342.936 344.1 51.0 253 343.5 6.4±0.6 0.15 0.09
A-13C1 21 14 8 – 20 14 7 – 254 444.432 451.2 25.5 254 444.7 6.7±0.6 0.15 0.07
A-13C1 21 14 7 + 20 14 6 + 254 444.432 451.2 25.5 † 6.7±0.6
A-13C1 21 14 7 + 20 14 7 – 254 444.432 451.2 6.22 † 6.7±0.6
A-13C1 21 14 8 – 20 14 6 + 254 444.432 451.2 6.22 † 6.7±0.6
E-13C1 21 10 11 20 10 10 254 626.092 388.9 44.1 254 625.8 7.4±0.6 0.22 0.06
E-13C1 22 2 20 21 2 19 254 899.597 337.9 58.0 254 899.8 6.8±0.6 0.15 0.11
A-13C1 21 9 13 + 20 9 12 + 255 417.206 375.3 46.5 255 417.1 7.1±0.6 0.07 0.14
A-13C1 11 5 7 + 10 4 6 + 255 417.848 242.4 2.44 † 7.9±0.6
A-13C1 21 9 12 – 20 9 11 – 255 418.028 375.3 46.5 † 8.1±0.6
A-13C2 21 5 16 – 20 5 15 – 261 016.105 338.3 52.3 261 016.8 6.2±0.6 0.43 0.10
A-13C2 22 12 10 + 21 12 9 + 262 404.906 427.7 40.9 262 404.6 7.3±0.6 0.18 0.10
A-13C2 22 12 11 – 21 12 10 – 262 404.906 427.7 40.9 † 7.3±0.6
A-13C2 22 3 19 – 21 3 18 – 263 026.207 342.3 56.1 263 025.8 7.5±0.6 0.14 0.10
E-13C2 22 3 19 21 3 18 263 484.906 441.3 56.1 263 484.6 7.4±0.6 0.10 0.11
E-13C1 23 –3 21 22 –3 20 264 936.868 350.6 60.7 264 936.9 7.0±0.6 0.13 0.12
E-13C1 7 –7 1 6 –6 1 264 937.868 236.2 3.22 † 8.1±0.6
A-13C1 24 2 23 – 23 2 22 – 265 443.450 354.0 63.8 265 442.1 8.5±0.6 0.11 0.11 DCOOCH3
A-13C2 22 6 17 – 21 6 16 – 265 640.606 356.9 53.7 265 640.8 6.8±0.6 0.14 0.08 CH3COOCH3
E-13C1 25 –1 25 24 0 24 266 482.702 356.6 11.5 266 483.3 6.3±0.6 0.35 0.29
E-13C1 25 0 25 24 0 24 266 482.602 356.6 67.6 † 6.2±0.6
E-13C1 25 0 25 24 –1 24 266 482.416 356.6 11.5 † 6.0±0.6
E-13C1 25 –1 25 24 –1 24 266 482.517 356.6 67.6 † 6.1±0.6
A-13C1 22 10 13 – 21 10 12 – 267 355.733 400.6 47.3 267 355.8 6.9±0.6 0.19 0.13
A-13C1 22 10 12 + 21 10 11 + 267 355.808 400.6 47.3 † 7.0±0.6
E-13C2 23 –4 20 22 –4 19 270 150.708 454.7 58.5 270 152.0 5.6±0.6 0.17 0.11
A-13C2 23 3 20 – 22 3 19 – 272 723.937 355.4 58.5 272 723.7 7.3±0.6 0.15 0.10
A-13C2 26 0 26 + 25 0 25 + 272 941.805 367.2 68.3 272 941.8 7.0±0.5 0.17 0.27
A-13C2 26 1 26 + 25 0 25 + 272 941.891 367.2 11.7 † 7.1±0.5
A-13C2 26 0 26 + 25 1 25 + 272 941.649 367.2 11.7 † 6.9±0.5
A-13C2 26 1 26 + 25 1 25 + 272 941.735 367.2 68.3 † 7.0±0.5
A-13C2 23 16 8 – 22 16 7 – 274 076.953 515.3 31.4 274 077.0 7.0±0.5 0.11 0.05
A-13C2 23 16 7 + 22 16 6 + 274 076.953 515.3 31.4 † 7.0±0.5
A-13C2 23 15 8 – 22 15 7 – 274 124.220 494.7 35.1 274 125.7 5.4±0.5 0.21 0.06 U
A-13C2 23 15 9 + 22 15 8 + 274 124.220 494.7 35.1 † 5.4±0.5
E-13C1 23 –4 20 22 –4 19 274 172.892 358.8 60.0 274 173.3 6.6±0.5 0.23 0.11
A-13C2 23 11 12 – 22 11 11 – 274 666.966 425.6 47.0 274 666.7 7.3±0.5 0.24 0.12
A-13C2 23 11 13 + 22 11 12 + 274 666.961 425.6 47.0 † 7.3±0.5
A-13C2 23 10 14 – 22 10 13 – 274 998.925 411.7 49.4 274 998.3 7.7±0.5 0.35 0.13 CH3OCH3
A-13C2 23 10 13 + 22 10 12 + 274 999.054 411.7 49.4 † 7.9±0.5
E-13C1 23 3 20 22 3 19 276 849.213 358.5 60.1 276 849.6 6.5±0.5 0.24 0.11
E-13C1 26 –1 26 25 –1 25 276 936.143 369.9 70.3 276 934.7 8.5±0.5 0.31 0.29 CH3CH2OH
E-13C1 26 0 26 25 0 25 276 936.189 369.9 70.3 † 8.6±0.5
E-13C1 26 0 26 25 –1 25 276 936.089 369.9 12.0 † 8.5±0.5
E-13C1 26 –1 26 25 0 25 276 936.244 369.9 12.0 † 8.7±0.5
E-13C2 24 –4 21 23 –4 20 280 723.536 468.2 61.1 280 722.7 7.9±0.5 0.22 0.11

Notes. Emission lines of 13C-HCOOCH3vt = 1 present in the spectral scan of Orion-KL from the IRAM 30-m radio-telescope. Column (1) indicates the species, being A-13C1: A-H13COOCH3vt = 1, E-13C1: E-H13COOCH3vt = 1, A-13C2: A-HCOO13CH3vt = 1, and E-13C2: E-HCOO13CH3vt = 1, Cols. (2)−(9) indicate the line transition, Col. (10) gives the predicted frequency obtained with the Hamiltonian parameters of this work for 13C2-MF and from Carvajal et al. (2010) for 13C1-MF, Col. (11) upper level energy, Col. (12) line strength, Col. (13) observed frequency assuming a vLSR of 7 km s-1, Col. (14) the radial velocity, Col. (15) observed main-beam temperature, Col. (16) modelled main-beam temperature, and Col. (17) blends. † Blended with previous line.

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