Table 1: Summary of the 13CO (2-1) and (1-0) observations. Intensity of the 13CO (1-0) line ( $T_{\rm mb}$) and 13CO (2-1)/(1-0) intensity ratio calculated from the $T_{\rm mb}$ temperatures without any correction for the different beam sizes. When the 13CO (2-1) line has not been detected we have used 3$\sigma $ upper limits to calculate the 2-1/1-0 ratio. The LVG results for $T_{\rm K}=20$ K are also displayed. For the sources where the 13CO (2-1)/(1-0) ratio could not be determined, we have assumed a H2 density of n=103-4.5  cm-3. The SiO column density, N(SiO), has been calculated for a H2 density of 104.5  cm-3. The SiO abundance relative to H2, X(SiO), has been calculated using a 13CO abundance of $5\times 10^{-6}$ (see text).

l		 b v Feature 13CO (1-0) 2-1/1-0 log(n(H2)) N(13CO) N(SiO) X(SiO)
deg deg km s-1   $T_{\rm mb}$(K)   log( cm-3) 1016  cm-2 1013  cm-2 10-9
-0.5030 -0.0500 144.5 L 0.8 $\pm$ 0.2 0.7 $\pm$ 0.4 3.0-4.0 1.1 <1.1 <5
-0.5900 -0.0500 152.8 L 0.5 $\pm$ 0.2 <1.7 <4.3 0.38 <0.8 <9.9
-0.6880 -0.0500 142.5 L 1.0 $\pm$ 0.7 0.7 $\pm$ 0.5 3.-3.5 0.6 1.0 7.9
0.9452 -0.0500 86.2 L 4.5 $\pm$ 0.3 1.0 $\pm$ 0.1 3.4-3.6 12 7.3 3.0
0.1500 -0.0500 154.7 K 1.2 $\pm$ 0.1 0.6 $\pm$ 0.1 3-3.5 0.45 <0.3 <3.1
1.3100 -0.1300 204.3 K 1.1 $\pm$ 0.3 ... ... 2-4 <0.2 <0.33
0.3899 -0.1500 195.8 K 0.8 $\pm$ 0.3 ... ... 0.8 <2.5 <15
1.4027 -0.1500 214.3 K 1.0 $\pm$ 0.1 0.6 $\pm$ 0.1 3.-3.4 2 0.4 0.88
1.5220 -0.1500 219.5 K 1.6 $\pm$ 0.3 ... ... 2.5 0.2 0.4
0.3899 -0.1500 -92.2 M 0.5 $\pm$ 0.3 1.3 $\pm$ 0.8 3.5-4.3 0.2-1 0.3 1.3-6.8
0.3899 -0.1500 -71.5 M 0.3 $\pm$ 0.2 <2.3 <4.3 >0.6 0.6 <5
0.9452 -0.0500 -81.0 M 1.0 $\pm$ 0.3 1.0 $\pm$ 0.4 3.-3.8 1.1 0.7 3.2
0.9452 -0.0500 -65.9 M 1.6 $\pm$ 0.3 0.7 $\pm$ 0.2 3.-3.5 2.8 0.4 0.63
-0.6880 -0.0500 -41.7 P 0.9 $\pm$ 0.4 1.5 $\pm$ 0.7 3.5-5 1.7 2.7 7.9
-0.6880 -0.0500 -17.5 P 1.0 $\pm$ 0.4 2.2 $\pm$ 0.9 3.5-5 1.0 3.2 16
-0.6880 -0.0500 2.3 P 2.0 $\pm$ 0.4 1.5 $\pm$ 0.3 3.5-5 1.0 5.0 25
-0.5900 -0.0500 -41.3 P 1.6 $\pm$ 0.2 0.9 $\pm$ 0.2 3.5-4 2.2 <1.4 <3.2
1.3100 -0.1300 -13.8 1.3 2.0 $\pm$ 0.3 0.8 $\pm$ 0.2 3.5-4.3 5.7 0.2 0.16
1.3100 -0.1300 33.7 1.3 1.9 $\pm$ 0.3 1.0 $\pm$ 0.2 3.5-4.3 5.7 9.5 8.3
1.3100 -0.1300 85.0 1.3 2.4 $\pm$ 0.3 1.1 $\pm$ 0.2 3.5-4.3 7.5 5.3 3.5
1.3100 -0.1300 135.0 1.3 0.5 $\pm$ 0.3 <1.7 <104 0.4 <0.1 <1.3
1.4027 -0.1500 -41.8 1.3 1.1 $\pm$ 0.1 0.6 $\pm$ 0.1 3. 0.6 <0.1 <1.0
1.4027 -0.1500 -22.9 1.3 1.5 $\pm$ 0.3 0.7 $\pm$ 0.2 3-3.5 1.9 0.5 1.2
1.4027 -0.1500 29.7 1.3 1.5 $\pm$ 0.2 0.9 $\pm$ 0.2 3.3-3.5 2.2-3.5 1.4 2.5
1.4027 -0.1500 72.3 1.3 1.6 $\pm$ 0.2 0.9 $\pm$ 0.1 3.3-3.5 6.6 2.3 1.7
1.4027 -0.1500 123.7 1.3 0.6 $\pm$ 0.0 1.3 $\pm$ 0.1 3.5-4.0 0.85 0.5 3
1.5220 -0.1500 -23.4 GCR 1.1 $\pm$ 0.8 0.8 $\pm$ 0.6 3.2-4 2.3 0.5 1.0
1.5220 -0.1500 56.0 GCR 1.1 $\pm$ 0.8 0.9 $\pm$ 0.7 <4.3 3.4 0.9 1.3
-0.6880 -0.0500 -129.1 GCR 2.6 $\pm$ 0.4 1.2 $\pm$ 0.2 3.5-4.5 4.5 1.1 1.2
-0.5900 -0.0500 132.9 GCR 0.3 $\pm$ 0.0 <3.3 ... 16 <0.8 <0.25
-0.5900 -0.0500 -148.5 GCR 1.1 $\pm$ 0.2 1.0 $\pm$ 0.3 3.5-4.5 2.5 <2.6 <5.2
-0.5900 -0.0500 -116.7 GCR 5.3 $\pm$ 0.2 1.0 $\pm$ 0.1 >3.5 9.5 3.0 1.6
-0.5030 -0.0500 -147.4 GCR 1.1 $\pm$ 0.2 0.6 $\pm$ 0.3 2.8-3.5 0.5 0.1-0.8 1.3-8
-0.5030 -0.0500 -53.5 GCR 1.0 $\pm$ 0.2 1.3 $\pm$ 0.4 3.5-4.5 1.4 0.7-2.1 2.5-7.5
0.1500 -0.0500 25.5 GCR 4.0 $\pm$ 0.4 1.2 $\pm$ 0.2 >3.5 6 <1 0.79
0.1500 -0.0500 61.1 GCR 5.3 $\pm$ 0.4 1.4 $\pm$ 0.1 >3.5 14 1.5 0.54
0.8300 -0.1800 31.3 GCR 5.0 $\pm$ 0.5 1.0 $\pm$ 0.1 >3.5 16 6.4 2
0.8300 -0.1800 56.9 GCR 0.5 $\pm$ 0.5 1.3 $\pm$ 1.5 3.5-4.5 1.1 8.5 30
0.8300 -0.1800 99.1 GCR 1.8 $\pm$ 0.5 1.0 $\pm$ 0.3 3.2-4.5 1.4 1.4 5
0.4100 0.0300 -51.0 GCR 1.1 $\pm$ 0.5 1.2 $\pm$ 0.6 3.5-4.2 1.9 2.5 6.6
0.4100 0.0300 -21.9 GCR 1.5 $\pm$ 0.5 0.8 $\pm$ 0.3 3.-3.5 3.3 1.1 1.7
0.4100 0.0300 17.0 GCR 3.9 $\pm$ 0.5 1.0 $\pm$ 0.2 3.5-4.3 6.8 12 8.8
0.4100 0.0300 37.9 GCR 5.1 $\pm$ 0.5 1.1 $\pm$ 0.1 >3.5 8.2 <1.3 <0.79
0.1000 -0.1200 -2.0 GCR 0.8 $\pm$ 0.0 2.2 $\pm$ 0.7 >3.5 1.1 0.9 4
0.1000 -0.1200 30.1 GCR 6.0 $\pm$ 0.6 1.0 $\pm$ 0.2 3.5-4.3 25 8.2 1.64
0.1000 -0.1200 68.1 GCR 1.9 $\pm$ 0.6 1.4 $\pm$ 0.6 >3.5 3.8 0.9 1.2
0.3899 -0.1500 -3.5 GCR 1.8 $\pm$ 0.2 1.5 $\pm$ 0.2 >3.7 1.9 <0.3 <0.7


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