Table 1: Observational parameters of the data sets obtained with KOSMA. Columns one and two indicate the line and transition frequency, followed by the number of points, the spacing (the data on a sampling raster of 30'' were regridded on a 60'' raster), and half power beam width (HPBW) in arcsec; $\eta _{\rm mb}$ is the main-beam efficiency, $T_{\rm sys}$ the average system temperature, $\Delta v_{\rm res}$ denotes the channel spacing, and $\Delta T_{\rm rms}$ the average rms noise temperature (of the data on a 60'' grid) per channel on a $T_{\rm mb}$ scale.
  $\nu$ #Points Grid HPBW $\eta _{\rm mb}$ $\langle T_{\rm sys}\rangle$ $\Delta v_{\rm res}$ $\langle\Delta T_{\rm rms}\rangle$
  [GHz]         [K] [km s-1] [K]
13CO  3$\;\to\;$2 330.588 9834 60'' 80'' 0.68 325 0.31 0.35
13CO  2$\;\to\;$1 220.399 37778 60'' 130'' 0.72 219 0.22 0.34
12CO  3$\;\to\;$2 345.796 21934 60'' 80'' 0.68 346 0.29 0.38
12CO  2$\;\to\;$1 230.537 77   130'' 0.72 222 0.21 0.09

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