Table 2: Source sizes used to convolve the data to 21.9''. For each source, we used maps (specified in Col. 5) to determine the shape of the Gaussian intensity profile (axisymmetric : a $\times $ a or elliptical: a $\times $ b) and estimate the values of the full widths at half maximum (FWHM).
  FWHM line (frequency) Observed beam size References

IC 10		 20.0'' $\times $ 20.0'' 12CO(4-3) (461 GHz) 14.5'' This work1
NGC 253a 23.0'' $\times $ 11.0'' 12CO(6-5) (691  GHz) 10.6'' Bayet et al. (2004)2
IC 342 11.0'' $\times $ 11.0'' 12CO(6-5) (691 GHz) 10.6'' This work3
Henize 2-10a 13.0'' $\times $ 13.0'' 12CO(3-2) (345 GHz) 22'' Meier et al. (2001)4
NGC 4038 13.2'' $\times $ 9.9'' 12CO(1-0) (115 GHz) 4.91'' $\times $ 3.15'' Wilson et al. (2000)5
Overlap 11.0'' $\times $ 8.8'' 12CO(1-0) (115 GHz) 4.91'' $\times $ 3.15'' Wilson et al. (2000)6
M 83 12.0'' $\times $ 10.6'' 12CO(6-5) (691 GHz) 10.6'' This work7
NGC 6946 17.0'' $\times $ 17.0'' 12CO(4-3) (461 GHz) 17'' Nieten et al. (1999)8
a We include the sources from Bayet et al. (2004). References: 1 The 20'' FWHM is in agreement with the size deduced from the CO maps found in Wilson & Reid (1991) or in Bolatto et al. (2000); 2 Bayet et al. (2004) found good agreement with the source size deduced from Peng et al. (1996) map; 3 The 11'' FWHM is very similar to the size deduced from the 12CO(4-3) map of Israel & Baas (2003). Eckart et al. (1990) using the IRAM-30 m telescope, obtained a map in the 12CO(2-1) line which shows a source size around 20''. 4 See Bayet et al. (2004); 5 OVRO map; 6 Overlap corresponds to SGMC 4-5 in this OVRO map; 7 Lundgren et al. (2004) considered the M 83 nucleus as a 12'' axisymmetric source which agrees with our value; 8 The 12CO(1-0) map published by Weliachew et al. (1988), is consistent with a 15'' source size.

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