\begin{table}%t6 \caption{\label{tab:CH3C15N} Lower state quantum numbers of rotational transitions of CH$_3$C$^{15}$N from present work, frequencies (MHz), uncertainties unc. (kHz), and residuals o$-$c (kHz) between observed frequencies and those calculated from the final set of spectroscopic parameters.} \par %\centerline \small\begin{tabular}{crcrr | crcrr | crcrr} \hline \hline $J''$ & \multicolumn{1}{c}{$K''$} & Frequency & \multicolumn{1}{c}{unc.} & o$-$c & $J''$ & \multicolumn{1}{c}{$K''$} & Frequency & \multicolumn{1}{c}{unc.} & o$-$c & $J''$ & \multicolumn{1}{c}{$K''$} & Frequency & \multicolumn{1}{c}{unc.} & o$-$c \\ \hline 18 & 12 & 338023.606 & 10 & 0 & 35 & 11 & 640278.287 & 70 & $-$75 & 56 & 7 & 1013569.196 & 30 & 51 \\ 18 & 6 & 338710.019 & 8 & $-$8 & 35 & 9 & 640754.725 & 30 & $-$9 & 56 & 6 & 1013809.982 & 30 & $-$23 \\ 18 & 5 & 338780.216 & 3 & 1 & 35 & 7 & 641136.691 & 50 & $-$38 & 56 & 5 & 1014014.014 & 50 & 45 \\ 18 & 4 & 338837.680 & 3 & 1 & 35 & 6 & 641292.126 & 40 & $-$18 & 56 & 4 & 1014180.965 & 20 & 7 \\ 18 & 3 & 338882.394 & 3 & $-$4 & 35 & 4 & 641531.486 & 30 & $-$18 & 56 & 3 & 1014310.943 & 50 & 36 \\ 18 & 2 & 338914.344 & 8 & $-$8 & 35 & 3 & 641615.332 & 50 & $-$23 & 56 & 2 & 1014403.766 & 20 & 3 \\ 18 & 1 & 338933.536 & 5 & 6 & 35 & 2 & 641675.251 & 20 & $-$22 & 56 & 1 & 1014459.492 & 30 & $-$0 \\ 18 & 0 & 338939.926 & 5 & 2 & 35 & 1 & 641711.248 & 20 & 16 & 56 & 0 & 1014478.090 & 50 & 19 \\ 24 & 12 & 444677.654 & 50 & 68 & 44 & 12 & 799556.798 & 100 & $-$10 & 57 & 8 & 1030975.149 & 50 & 27 \\ 24 & 11 & 444868.773 & 80 & $-$60 & 44 & 11 & 799895.712 & 80 & $-$58 & 57 & 6 & 1031502.077 & 20 & $-$9 \\ 24 & 10 & 445043.705 & 50 & 5 & 44 & 9 & 800486.471 & 50 & $-$2 & 57 & 5 & 1031709.364 & 30 & $-$6 \\ 24 & 9 & 445202.122 & 50 & 2 & 44 & 8 & 800737.904 & 100 & $-$84 & 57 & 4 & 1031879.082 & 20 & 6 \\ 24 & 7 & 445469.416 & 50 & 36 & 44 & 7 & 800960.070 & 50 & $-$74 & 57 & 3 & 1032011.155 & 20 & 15 \\ 24 & 6 & 445578.097 & 50 & $-$19 & 44 & 6 & 801152.797 & 50 & $-$59 & 57 & 2 & 1032105.530 & 20 & 23 \\ 24 & 5 & 445670.197 & 50 & 1 & 44 & 5 & 801315.982 & 50 & $-$66 & 57 & 1 & 1032162.147 & 20 & 4 \\ 24 & 4 & 445745.587 & 50 & 4 & 44 & 4 & 801449.656 & 50 & $-$1 & 57 & 0 & 1032181.021 & 20 & $-$4 \\ 24 & 3 & 445804.286 & 50 & 36 & 44 & 3 & 801553.593 & 50 & $-$37 & 60 & 8 & 1083996.412 & 30 & $-$21 \\ 24 & 2 & 445846.202 & 50 & 31 & 44 & 2 & 801627.891 & 50 & $-$35 & 60 & 7 & 1084292.050 & 50 & $-$17 \\ 24 & 1 & 445871.360 & 50 & 29 & 44 & 1 & 801672.512 & 50 & $-$2 & 60 & 5 & 1084765.613 & 80 & $-$70 \\ 24 & 0 & 445879.744 & 50 & 26 & 44 & 0 & 801687.390 & 50 & 10 & 60 & 3 & 1085081.878 & 50 & 41 \\ 25 & 11 & 462645.335 & 100 & 10 & 45 & 5 & 819063.889 & 50 & $-$13 & 60 & 1 & 1085240.023 & 20 & $-$15 \\ 25 & 10 & 462827.117 & 100 & 34 & 45 & 4 & 819200.272 & 50 & $-$71 & 60 & 0 & 1085259.811 & 20 & $-$9 \\ 25 & 9 & 462991.739 & 50 & $-$7 & 45 & 3 & 819306.491 & 50 & $-$29 & 61 & 10 & 1100941.061 & 50 & 29 \\ 25 & 8 & 463139.273 & 50 & 22 & 45 & 2 & 819382.243 & 80 &$-$148 & 61 & 9 & 1101320.232 & 50 & $-$73 \\ 25 & 7 & 463269.567 & 50 & 28 & 46 & 9 & 835943.102 & 150 & $-$54 & 61 & 6 & 1102220.449 & 20 & 8 \\ 25 & 6 & 463382.606 & 50 & 46 & 46 & 6 & 836637.725 & 80 & $-$26 & 61 & 5 & 1102440.856 & 30 & $-$18 \\ \hline 25 & 5 & 463478.295 & 50 & 26 & 46 & 5 & 836807.842 & 80 & $-$10 & 61 & 3 & 1102761.793 & 20 & 8 \\ 25 & 4 & 463556.690 & 50 & 63 & 46 & 4 & 836947.184 & 80 & 67 & 61 & 2 & 1102862.131 & 20 & $-$7 \\ 25 & 3 & 463617.624 & 50 & 18 & 46 & 3 & 837055.463 & 50 & $-$29 & 61 & 0 & 1102942.430 & 20 & $-$14 \\ 25 & 2 & 463661.238 & 50 & 58 & 46 & 2 & 837132.851 & 50 & $-$82 & 62 & 12 & 1117699.499 & 200 & 171 \\ 25 & 1 & 463687.317 & 50 & $-$13 & 46 & 1 & 837179.357 & 50 & $-$52 & 62 & 10 & 1118588.819 & 30 & 3 \\ 25 & 0 & 463696.065 & 50 & 17 & 49 & 12 & 888070.867 & 100 & 3 & 62 & 9 & 1118973.704 & 30 & 16 \\ 26 & 12 & 480213.412 & 100 & 51 & 49 & 11 & 888445.580 & 120 & 42 & 62 & 8 & 1119318.436 & 20 & $-$11 \\ 26 & 11 & 480419.811 & 100 & 143 & 49 & 10 & 888788.116 & 100 & $-$1 & 62 & 7 & 1119622.944 & 20 & $-$18 \\ 26 & 9 & 480779.185 & 50 & $-$16 & 49 & 9 & 889098.523 & 50 & 52 & 62 & 6 & 1119887.123 & 20 & 11 \\ 26 & 8 & 480932.181 & 80 &$-$107 & 49 & 6 & 889835.075 & 50 & 23 & 62 & 5 & 1120110.797 & 20 & $-$2 \\ 26 & 7 & 481067.510 & 50 & 2 & 49 & 5 & 890015.474 & 50 & 40 & 62 & 4 & 1120293.942 & 20 & 8 \\ 26 & 6 & 481184.797 & 50 & $-$9 & 49 & 4 & 890163.134 & 50 & 17 & 62 & 3 & 1120436.478 & 30 & 32 \\ 26 & 5 & 481284.187 & 50 & 49 & 49 & 3 & 890278.046 & 50 & 5 & 63 & 11 & 1135800.408 & 120 & 63 \\ 26 & 4 & 481365.532 & 50 & 70 & 49 & 2 & 890360.170 & 50 & 7 & 63 & 8 & 1136971.561 & 30 & 17 \\ 26 & 3 & 481428.740 & 50 & $-$8 & 49 & 1 & 890409.470 & 50 & 21 & 63 & 6 & 1137548.452 & 20 & 5 \\ 26 & 2 & 481473.947 & 50 & $-$23 & 49 & 0 & 890425.897 & 50 & 18 & 63 & 5 & 1137775.379 & 20 & 6 \\ 26 & 1 & 481501.168 & 50 & 56 & 50 & 11 & 906143.305 & 150 & $-$87 & 63 & 4 & 1137961.166 & 20 & 5 \\ 26 & 0 & 481510.165 & 50 & 6 & 50 & 10 & 906492.536 & 80 & 97 & 63 & 3 & 1138105.724 & 20 & $-$14 \\ 27 & 9 & 498564.375 & 50 & $-$25 & 50 & 9 & 906808.668 & 50 & 17 & 63 & 2 & 1138209.052 & 20 & 5 \\ 27 & 8 & 498723.057 & 100 & $-$3 & 50 & 8 & 907091.879 & 80 & $-$30 & 63 & 1 & 1138271.082 & 30 & 32 \\ 27 & 7 & 498863.213 & 80 & 12 & 50 & 7 & 907342.068 & 80 & $-$35 & 64 & 11 & 1153431.417 & 80 & 18 \\ 27 & 6 & 498984.839 & 50 & 69 & 50 & 6 & 907559.150 & 50 & 15 & 64 & 10 & 1153868.550 & 50 & 26 \\ 27 & 5 & 499087.724 & 50 & 8 & 50 & 5 & 907742.947 & 50 & 25 & 64 & 8 & 1154619.250 & 30 & $-$3 \\ 27 & 3 & 499237.616 & 50 & 24 & 50 & 4 & 907893.365 & 50 & $-$27 & 64 & 7 & 1154932.519 & 80 & $-$51 \\ 27 & 2 & 499284.459 & 50 & $-$1 & 50 & 3 & 908010.479 & 50 & $-$7 & 64 & 6 & 1155204.355 & 30 & $-$4 \\ 27 & 0 & 499322.004 & 50 & 38 & 51 & 12 & 923448.206 & 100 & $-$16 & 64 & 5 & 1155434.482 & 30 & $-$29 \\ 28 & 9 & 516347.309 & 80 & 49 & 51 & 10 & 924192.510 & 100 & $-$0 & 64 & 4 & 1155622.929 & 20 & $-$12 \\ 28 & 8 & 516511.508 & 50 & 27 & 51 & 9 & 924514.553 & 80 & $-$9 & 64 & 3 & 1155769.523 & 80 & $-$50 \\ 28 & 7 & 516656.554 & 50 & 18 & 51 & 8 & 924803.059 & 50 & 10 & 64 & 2 & 1155874.320 & 80 & $-$32 \\ 28 & 6 & 516782.448 & 50 & 82 & 51 & 7 & 925057.871 & 50 & 9 & 64 & 1 & 1155937.201 & 30 & $-$34 \\ 28 & 5 & 516888.896 & 50 & $-$26 & 51 & 6 & 925278.880 & 50 & $-$21 & 64 & 0 & 1155958.150 & 30 & $-$49 \\ 28 & 3 & 517044.107 & 50 & 56 & 51 & 5 & 925466.075 & 50 & $-$6 & 65 & 9 & 1171901.821 & 30 & 10 \\ 34 & 13 & 621972.452 & 50 & $-$23 & 51 & 4 & 925619.334 & 50 & 5 & 65 & 8 & 1172261.466 & 30 & $-$24 \\ 34 & 12 & 622261.132 & 50 & 8 & 51 & 3 & 925738.595 & 50 & 11 & 65 & 7 & 1172579.205 & 30 & 23 \\ 34 & 11 & 622527.126 & 30 & 33 & 51 & 2 & 925823.803 & 50 & 3 & 65 & 5 & 1173088.143 & 20 & 15 \\ 34 & 9 & 622990.550 & 50 & $-$45 & 51 & 1 & 925874.943 & 50 & 0 & 65 & 3 & 1173427.860 & 50 & $-$7 \\ 34 & 8 & 623187.975 & 20 & 24 & 51 & 0 & 925891.997 & 50 & 4 & 65 & 2 & 1173534.097 & 20 & $-$11 \\ 34 & 6 & 623513.510 & 20 & 21 & 55 & 10 & 994948.576 & 150 & $-$48 & 65 & 0 & 1173619.153 & 20 & 28 \\ 34 & 5 & 623641.561 & 20 & 17 & 55 & 8 & 995602.961 & 80 & $-$85 & 66 & 12 & 1188185.703 & 150 &$-$111 \\ 34 & 4 & 623746.418 & 40 & 34 & 55 & 7 & 995876.199 & 50 & 26 & 66 & 9 & 1189533.633 & 80 & 73 \\ 34 & 3 & 623827.915 & 50 & $-$56 & 55 & 6 & 996113.103 & 50 & 6 & 66 & 7 & 1190220.192 & 30 & $-$24 \\ 34 & 2 & 623886.265 & 20 & $-$4 & 55 & 5 & 996313.763 & 50 & 33 & 66 & 6 & 1190499.574 & 30 & $-$01 \\ 34 & 1 & 623921.231 & 30 & $-$27 & 55 & 3 & 996605.769 & 50 & $-$48 & 66 & 5 & 1190736.074 & 100 & $-$64 \\ 34 & 0 & 623932.881 & 30 & $-$41 & 55 & 2 & 996697.183 & 50 & 27 & 66 & 4 & 1190929.820 & 50 & 4 \\ 35 & 14 & 639388.490 & 150 & 4 & 55 & 1 & 996752.051 & 50 & 77 & 66 & 2 & 1191188.194 & 50 & $-$36 \\ 35 & 13 & 639708.307 & 100 & $-$38 & 55 & 0 & 996770.268 & 50 & 19 & 66 & 1 & 1191252.892 & 30 & 27 \\ 35 & 12 & 640004.964 & 40 & $-$44 & 56 & 9 & 1012977.101 & 30 & $-$21 & & & & & \\ \hline \end{tabular} \end{table}