\begin{table}%t1
%\centering
\par
\caption {\label{mtfvt1lab} Laboratory measurements, calculated frequencies and line strengths for methyformate transitions in the first torsionally excited state used in the present detection.} 
\begin{tabular}{cccccccccccccc}
\hline\hline
 $J\arcmin$ & $K_{\rm a}\arcmin$ & $K_{\rm c}\arcmin$ & $P\arcmin$ & $J\arcsec$ & $K_{\rm a}$\arcsec & $K_{\rm c}$\arcsec & $P$\arcsec  & Obs. Freq.  & Calc. Freq. & Calc. Unc & Obs.-Calc. &$S{\mu}^2$ & ${E_{\rm l}}$  \\
\multicolumn{4}{c}{Upper state$^a$} & \multicolumn{4}{c}{Lower state$^a$} & (MHz)$^b$ & (MHz)$^c$ & (kHz)$^c$ & (MHz)$^c$ & (D$^2$) & (cm$^{-1}$)$^d$ \\
\hline
 7  	&  4 		&  4 	& --  	& 6 	&  4 		&  3 	& --  	&  85~327.104 	&   85~327.085 	&    11	&   0.019 	& 12.483 	& 146.8606  	\\
 7  	&  4 		&  3 	& + 	& 6 	&  4 		&  2 	& + 	&  85~360.669 	&   85~360.823 	&    11 	&  --0.154 	& 12.483 	& 146.8610  	\\
 7  	&  3 		&  5 	& + 	& 6 	&  3 		&  4 	& + 	&  85~371.762 	&   85~371.789 	&    11 	&  --0.027 	& 15.120 	& 143.6253  	\\
 7  	& --6 		&  2 	&   	&  6	&  --6 	&  1 	&   	&                	&   85~456.630 	&    19 	&            	&   4.944	& 155.5393  	\\
 7  	&  4 		&  3 	&   	&  6 	&  4  	& 2  	&   	&  85~506.175 	&   85~506.179	&    16 	&  --0.004 	& 12.571 	& 146.6097  	\\  
 7  	& --5 		&  3 	&   	&  6 	& --5 		&  2 	&    	&  85~553.365 	&   85~553.288 	&    17 	&   0.077 	&  9.123 	& 150.4139   	\\
10 	&  2 		&  9 	& -- 	& 10 & 1 		& 10 & + 	&  85~664.038 	&   85~663.943 	&    20 	&  0.095 	&  1.403 	& 151.8343     	\\
11 	&  4 		&  7 	& + 	& 11 & 3 		& 8 	& --  	&  85~727.753 	&   85~727.728 	&    18 	&  0.025 	&  3.078 	& 162.4132   	\\
  7 	& --4 		&  4 	&    	&  6 	& --4 		&  3	&   	&  85~743.967 	&   85~743.894 	&    16 	&  0.073 	& 12.532 	& 146.2356     	\\
  7 	&  2 		&  5 	& + 	&  6	& 2 		& 4 	& + 	&  88~998.368 	&   88~998.415 	&    12 	& --0.047 	& 17.049 	& 141.4958      	\\
  7 	&  2 		&  5 	&    	&  6 	& 2 		& 4 	&  	&  89~140.383 	&   89~140.366 	&    18 	&  0.017 	& 17.051 	& 141.0232    	\\
25 	&  5 		& 20 & -- 	& 25 & 4 		& 21 & + 	&                    	&  107~021.644 	&   361 	&         	&  8.289  	& 274.8357    	\\
  9 	& --2 		&  8 	&    	&  8 	& --2 		&  7  & 	&  107~022.162 	&  107~022.092 	&    13 	&   0.070 	& 22.628  	& 146.6924    	\\    
10 	&  1 		&  9 	& --  	&  9  &  2 		&  8 	& -- 	&  107~472.351 	&  107~472.387 	&    15 	&  --0.036	&   2.144  & 150.7587   	\\
  9 	& --3 		&  7	&    	&   8 & --3  	& 6  	&    	&  111~005.617 	&  111~005.582 	&    19 	&   0.035 	& 20.800  	& 149.1777     	\\
  9 	&  1 		&  8 	&    	&   8 &  1 		&  7  &    	&  111~094.105 	&  111~094.056 	&    13 	&   0.049	& 23.222  	& 146.0900    	\\
12 	&  0 		& 12 & + 	& 11 &  0 		& 11 & + 	&  131~536.624 	&  131~536.653  &   12 	&  --0.029	& 31.375 	& 155.8502   	\\  
12 	&  0 		& 12 &    	& 11 &  0 		& 11 &    	&  131~612.344 	&  131~612.301 	&    13 	&   0.043 	& 31.558 	& 155.3072    	\\
12 	&  1 		& 12 & + 	& 11 &  0 		& 11 & + 	&  131~764.316 	&  131~764.341 	&    12 	&  --0.025 	&   4.870	& 155.8502    	\\
11 	&  5 		&  7 	& +  & 10 &  5 		&  6 	& + 	&  134~531.846  &  134~531.833 	&    13 	&   0.013 	& 23.125 	& 164.8530     	\\
27 	&  7 		& 20 & --  	& 27 &  6 		& 21 & + 	&                    	&  134~545.609 	&   582 	& 	   	&   8.581 	& 304.5077     	\\
11 	& --7 		& 5  	&  	& 10 & --7 		&  4 	&   	&  134~545.615 	&  134~545.516 	&    27 	&   0.099 	& 17.431 	& 175.4588    	\\ 
35 	& 8 		& 27 & + 	& 35 &  7 		& 28 & --  	&               	&  134~553.290  &  912 	&            	& 12.622 	& 416.6235     	\\
11 	& 5 		& 6 	& --  	& 10 &  5 		&  5 	& --	&  134~585.070 	&  134~585.141 	&    13  	&  --0.071 	& 23.125 	& 164.8541     	\\
11 	& --3	 	&  9	&  	& 10 & --3 		&  8 	& 	&  134~713.629	&  134~713.526 	&    16 	&   0.103 	& 26.708 	& 156.9827 	\\ 
11 	& 5 		&  6 	&  	& 10 &  5 		&  5  & 	&  134~739.630 	&  134~739.629 	&    19 	&   0.001	& 23.251 	& 164.7142     	\\
12 	& 2 		& 11 & -- 	& 11 &  2 		& 10 & -- 	&  140~020.525 	&  140~020.564 	&    12 	&  --0.039 	&  30.616	& 158.9957     	\\
11 	& 2 		& 9 	& + 	& 10 &  2 		&  8	& + 	&  140~166.667 	&  140~166.713 	&    12 	&  --0.046	&  28.103 	& 155.9781     	\\  
12 	& --2 		& 11 &  	& 11 & --2 		& 10 & 	&  140~324.728 	&  140~324.699 	&    12 	&   0.029 	&  30.787 	& 158.5211    	\\
13 	& --1 		& 13 &  	& 12 & --1 		& 12 & 	&  142~032.334 	&  142~032.293 	&    14 	&   0.041 	&  34.222 	& 159.7047     	\\
13  	& 0 		& 13 & + 	& 12 &  0 		& 12 & + 	&  142~052.800 	&  142~052.735 	&    14 	&   0.065 	&  34.029 	& 160.2378     	\\
13  	& 0 		& 13 &   	& 12 &  0 		& 12 & 	&  142~125.416 	&  142~125.410 	&    14 	&   0.006 	&  34.224 	& 159.6973     	\\
13  	& 1 		& 13 & + 	& 12 &  0 		& 12 & +	&  142~185.220 	&  142~185.198 	&    14 	&   0.022 	&    5.339 & 160.2378     	\\
15  	& 0 		& 15 & +  & 14 &  1 		& 14 & + 	&  163~042.398 	&  163~042.248 	&    20 	&   0.100  &    6.267 & 170.0683   	\\
15  	& 1 		& 15 & +  & 14 &  1 		& 14 & + 	&  163~086.032 	&  163~085.873 	&    20 	&   0.159 	&  39.344 	& 170.0683     	\\
15  	& 0 		& 15 &   	& 14 & --1 		& 14 & 	&  163~113.094 	&  163~113.156 	&    18	&  --0.062 	&   6.073 	& 169.5325     	\\
15  	& 0 		& 15 & + 	& 14 &  0 		& 14 & + 	&  163~118.722 	&  163~118.574 	&    20 	&   0.148 	&  39.345 	& 170.0657     	\\
14  	& 1 		& 13 &   	& 13 &  1 		& 12 & 	&  163~142.587 	&  163~142.607 	&    14	&  --0.020 	&  36.185 	& 168.1362     	\\
15  	& --1 		& 15 &  	& 14 & --1 		& 14 & 	&  163~154.325 	&  163~154.404 	&    18 	&  --0.079 	&  39.561 	& 169.5325     	\\
15  	& 0 		& 15 &  	& 14 &  0 		& 14 & 	&  163~185.864 	&  163~185.922 	&    18 	&  --0.058 	&  39.561 	& 169.5300     	\\
15  	& --1 		& 15 &  	& 14 &  0 		& 14 & 	&  163~227.097 	&  163~227.169 	&    18 	&  --0.072 	&    6.074 & 169.5300     	\\
16  	& 0 		& 16 & +  & 15 &  1 		& 15 & +	&  173~616.616 	&  173~616.407 	&    25 	&   0.209 	&    6.727 & 175.5082   	\\
16  	& 1 		& 16 & +  & 15 &  1 		& 15 & + 	&  173~641.411 	&  173~641.171 	&    25 	&   0.240 	&  42.007 & 175.5082   	\\
16  	& 0 		& 16 & +  & 15 &  0 		& 15 & + 	&  173~660.281 	&  173~660.032 	&    25 	&   0.249 	&  42.007 & 175.5068   	\\
16  	& 0 		& 16 &   	& 15 & --1 		& 15 & 	&  173~683.479 	&  173~683.597 	&    23 	&  --0.118 	&   6.525 	& 174.9747   	\\
24  	& 3 		& 21 &  -- 	& 24 &  2 		& 22 & + 	&                    	&  173~704.470 	&   241 	&            	&   4.324 	& 254.0651     	\\
16  	& --1 		& 16 &   	& 15 & --1 		& 15 & 	&  173~706.683 	&  173~706.807 	&    23 	&  --0.124 	&  42.232 	& 174.9747   	\\
16  	& 0 		& 16 &   	& 15 &  0 		& 15 & 	&  173~724.731 	&  173~724.845 	&    23 	&  --0.114 	&  42.232 	& 174.9733   	\\
16  	& --1 		& 16 &   	& 15 &  0 		& 15 & 	&  173~747.990 	&  173~748.055 	&    23 	&  --0.065 	&    6.525 & 174.9733   	\\
16  	& 5 		& 11 &   	& 15 &  5 		& 10 & 	&  198~384.885 	&  198~384.966 	&    32 	&  --0.081 	&  38.205 	& 191.3885     	\\
26  	& 8 		& 19 &--  	& 26 &  7 		& 20 & + 	&                    	&  198~429.332 	&   290 	&             &   6.921 	& 297.4256   	\\
16  	& 5 		& 11 &--  	& 15 &  5 		& 10 & -- 	&                    	&  198~539.350 	&    30    	&           	& 38.279 	& 191.5148      	\\ 
16  	& --5 		& 12 &  	& 15 & --5 		& 11 &  	&  198~578.563 	&  198~578.589  &   33  	&  --0.026 	& 38.090 	& 191.0593   	\\ 
19  	& 3 		& 16 &--  	& 18 &  4 		& 15 & --	&            		&  207~295.959 	&  118 	&             &   2.804 	& 208.1331   	\\
17  	& 12 	&  5 	&+  	& 16 & 12 	&  4	& + 	&        		&  207~354.058 	&   101 	&	    	& 12.640 	& 252.9573      	\\
17  	& 12 	&  6 	&--  	& 16 & 12 	&  5 	& --	&          		&  207~354.058 	&   101 	&       	&  12.640 & 252.9573     	\\
17 	& --13	&  5 	&   	& 16 & --13 	&  4 	&  	&        		&  207~376.777 	&   145 	&          	&  18.783 & 264.5661      	\\   
17 	&  9  	& 8  	&    	& 16 &  9 		&  7	&  	&           		&  207~397.312 	&    68 	&             &  32.511 & 223.9160    	\\
\hline
17 	& 11 	&  7 	& + 	& 16 & 11 	&  6	& + 	&        		&  207~404.993 	&    81 	&           	&  26.248 & 242.2767      	\\
17 	& 11 	&  6 	& --  	& 16 & 11 	&  5	& -- 	&         		&  207~404.993 	&   81 	&             &  26.248 & 242.2767      	\\
17 	& 10 	&  8 	& --  	& 16 & 10 	&  7	& -- 	&         		&  207~500.297 	&    66 	&             &  29.526 & 232.5324     	\\
17 	& 10		&  7 	& + 	& 16 & 10 	&  6	& +	&        		&  207~500.297 	&    66 	& 	        &  29.526 & 232.5324    	\\
19 	&  2		& 18 & --  	& 18 &  1 		& 17	& -- 	&         		&  215~130.469 	&    47 	&     	        &  6.562 	& 199.2115    	\\
18	&  5		& 13 & -- 	& 17 &  5 		& 12	& -- 	&          		&  225~648.010 	&    57 	& 	        &  44.072 & 205.2072     	\\
19 	& 2 		& 17 & + 	& 18	&  2 		& 16	& +	&        		&  225~702.569 	&    46 	&         	&  48.659 & 203.7419     	\\
 6  	& 6  		& 1 	& -- 	&  5 	&  5 		&  0 	& --  	&            		&  225~727.540 	&    30 	&             &   2.592 	& 148.5921     	\\
 6  	& 6  		& 0 	& + 	& 5 	&  5 		& 1 	& + 	&            		&  225~727.552 	&    30 	&             &   2.592 	& 148.5921   	\\
18 	&  5 		& 13 &  	& 17 &  5 		& 12 &  	&           		&  225~756.154 	&    54 	&             &  43.428 	& 205.0713     	\\
 7  	& 6 		& 1 	& + 	&  6 	&  5 		&  2 	& + 	&            		&  237~899.077 	&    27 	&           	&   2.594 	& 151.0254    	\\
20 	& 3  		& 18 & + 	& 19 &  2 		& 17 & + 	&        		&  237~969.273 	&    58 	&             &   5.371 	& 211.2706    	\\
37 	&  7 		& 31 & + 	& 37 &  6 		& 32 & --  	&        		&  238~027.934 	&  1642 	&            	&   8.537 	& 434.5487    	\\
20 	&--14  	& 7  	&   	& 19 & --14 	&  6 	& 	&          		&  244~000.464 	&   195 	&             & 27.134 	& 299.1664    	\\
20 	& 15  	& 5 	& -- 	& 19 & 15 	&  4 	& -- 	&         		&  244~048.806 	&   207 	&           	& 23.017 	& 312.5791    	\\
20 	& 15  	& 6 	& + 	& 19 & 15 	&  5 	& +  &       		&  244~048.806 	&   207 	&             & 23.017	& 312.5791    	\\
19 	&  4  	& 15 & + 	& 18 &  4 		& 14 & + 	&       		&  244~066.113 	&    79 	&             & 48.355	& 209.5678    	\\
27 	&  1  	& 26 & --  	& 27 &  0 		& 27 & +  &      		&  244~066.575 	&   470 	&             &  1.456 	& 268.2307    	\\
20 	& 14  	& 6 	& +  & 19 & 14 		&  5 	& + 	&       		&  244~073.956 	&   178	&             & 20.522 	& 299.0954    	\\
20 	& 14  	& 7 	& --  	& 19 & 14 	&  6 	& -- 	&         		&  244~073.956 	&   178 	&             & 20.522 	& 299.0954    	\\
20 	& 10  	& 10 &  	& 19 & 10 	&  9 	& 	&           		&  244~112.669 	&   108 	& 	       	&  39.852 	& 254.7516    	\\
20 	& 13  	& 7 	& --  	& 19 & 13 	&  6 	& -- 	&         		&  244~119.960 	&   154 	&             &  24.670 	& 286.5471    	\\
20 	& 13  	& 8 	& + 	& 19 & 13 	&  7 	& + 	&        		&  244~119.960 	&   154 	&             &  24.670 	& 286.5471    	\\
20 	& 12  	& 8 	& + 	& 19 & 12 	&  7 	& + 	&        		&  244~198.512 	&   134 	&             & 34.020 	& 274.9352    	\\
20 	& 12  	& 9 	& --  	& 19 & 12 	&  8 	&  -- 	&        		&  244~198.512 	&   134 	&            	&  34.020 	& 274.9352    	\\
20 	& --13 	&  8 	&   	& 19 & --13 	&  7 	& 	&          		&  244~207.619 	&   159 	&            	& 30.739 	& 286.5459    	\\
\hline 
\end{tabular}
\par
\smallskip
$^a$ Upper and lower state transitions quantum numbers. The rotational quantum number~$J$, and the asymmetric rotor labels $K_{\rm a}$ and $K_{\rm c}$ are identified for each energy level. For the A symmetry species, 
$P$ is the parity quantum number, for the $E$~species, $P$~is not defined, instead, the $K_{\rm a}$~label has a signed value \citep{hougen94, ilyushin07}. Note that this information has been suppressed in Table~\ref{mtfvt1}, otherwise the quantum number labeling is the same. $^b$ Observed laboratory frequencies in MHz from \citet{ogata2004}, the experimental uncertainty is 50~kHz for all measured lines; $^c$ calculated frequencies, uncertainties and obs-calc values are from \citep{carvajal07} for the measured lines, the predicted frequencies and uncertainties for unmeasured lines is from Kleiner et al. (private communication); 
  $^d$ lower state energy in~cm$^{-1}$, relative to the $J=K=0$ A species levels, set as zero energy. 
   \end{table}