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Table 4:

HCO+ observations. Isotopes are abbreviated as 12 (HCO+), 13 (H13CO+), and 18 (HC18O+).
      $T_{\rm L}$, K a ${v_{\rm LSR},\rm km~s^{-1}}\ ^b$ 10% width c Profile ${\rm Size, arcsec}$ PA  
source isotope line peak centroid abs. km s-1 type $\Delta l$ $\Delta b$ deg. remark
SGRB2MC 12 3-2 9.7 ? 70.6 67.7         complex profile,
  13 3-2 4.0 56.7 62.5 30.7 R       broad abs. below cont.
G10.62-0.38 12 3-2 21.5 -5.1 0.0 18.1   22.8 20.5 84 self-abs., SO2
  13 3-2 4.2 -2.94 -2.1 12.0 B        
  18 3-2 1.0 -2.46 --            
G10.96+0.01E 12 3-2 <0.045               (1)
G10.96+0.01W 12 3-2 ${\sim}0.2$ 30.0 -- ${\sim}10$         marginal
G12.21-0.10 12 3-2 5.8 24.1 -- 13.5   16.2 12.8 71 SO2
G25.5+0.2A 12 3-2 <0.20               (1)
G28.20-0.04N 12 3-2 3.6 ? 45.0 22.9   16.6 14.2 73 HCO+(3-2) self-abs.; SO2
  13 3-2 0.61 43.0 44.3 11.9 B        
  18 3-2 0.13 44.0 --            
G28.20-0.04S 12 1-0 0.22 41.5 -- ${\sim}8$ C        
G28.28-0.36 12 3-2 1.9 47.1 -- ${\sim}12$          
G29.96-0.02 12 3-2 9.6 97.7 -- 10.9   19.2 17.6 62 wings ?
G30.54+0.02 12 3-2 2.8 48.3 -- 8.1   21 18 -12 red em. wing
G31.41+0.31 12 3-2 3.1 ? 98.5 ${\sim}23$   18 14 65 HCO+ self-abs. below cont;SO2
  13 3-2 1.4 98.0 98.8 9.6 B       line-rich
G32.80+0.19 12 3-2 4.2 ? 14.5 17.3   20 19 -11 broad self-abs.
  13 3-2 1.3 14.9 14.1 12.9 B        
G33.13-0.09 12 3-2 1.6 76.6 76.4 12.7   25 17 -85  
  13 3-2 0.32 76.6 76.1 7.5 R        
G33.560+0.20 12 3-2 <0.09               (1)
G34.26+0.15B 12 3-2 13.2 ? 60.8 14.3   29 25 -27 SO2, OCS, line-rich
  13 3-2 2.8 58.7 60.1 8.7 B        
G35.20-1.74 12 3-2 6.5 ? 43.7 11.3   27 26 61  
  13 3-2 0.94 44.5 43.5 7.9 R        
  18 3-2 0.11 45.5 --            
G41.71+0.11 12 3-2 <0.11               (1)
G43.89-0.78 12 3-2 1.8 ? 55.2 ${\sim}15$   21 21 -4  
  13 3-2 0.64 54.0 55.1 6.5 R        
G45.07+0.13 12 3-2 6.4 ? -- 20.7   15 14 -79 asymm. profile
  13 3-2 1.2 58.0   10.8          
G45.12+0.13 12 3-2 6.3 59.8 -- 11.6   38 35 28 red em. wing
W51D 12 3-2 14.9 ${\sim}60.0$ 51.1 20.8   21 15 -86 complex profile, SO2
  13 3-2 1.9 60.9 11.6 ${\sim}52$ R        
  12 1-0 10.5 ${\sim}60.0$ 52.6 16.8         complex profile
G70.29+1.60 12 3-2 8.5 -23.0 -- 14.6   24 19 -87 weak wings
  12 1-0 7.9 -23.9 -- 15.2         weak wings
G81.67+0.53 12 3-2 12.3 ? -1.8 27.2   33 27 4 weak wings
  13 3-2 2.1 -3.3 -1.9 11.9 B        
G81.68+0.54 12 3-2 4.1 -2.7 -2.4 25.9         weak wings
  13 3-2 1.8 -2.5 -2.2 4.6 B        
G111.612 12 1-0 6.0 -56.6 -- 5.9          
NGC 7538IRS1 12 3-2 7.5 -57.5 -- 13.7   59 48 48 complex profile, red wing
NGC 7538IRS2 12 1-0 2.9 -60.0 -62.7 17.8         complex profile, wings

Notes. The size of the HCO+(3-2) source is approximated by an ellipse with major axis $\Delta l$, its position angle PA, and minor axis $\Delta b$.
(a) Typical rms errors are 150, 50, and 20 mK for the HCO+, H13CO+, and HC18O+ isotopes (see also Fig. 1); (b) errors are ${\la}0.8$ km s-1 (half the channel spacing); (c) the error is ${\la}1$ km s-1 for values preceded by $\sim$, the other values have errors of ${\sim}0.1$ km s-1.
(1) 1$\sigma$ upper limit for 2.1 km s-1 spectral resolution over a ${\pm}80$ km s-1 range; ? line profile too complex.


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