... 2000

Based on observations collected with the Medicina 32-m radiotelescope. The Medicina telescope is operated by the Istituto di Radioastronomia, C.N.R., Bologna.

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...

Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.125.5)
or via
http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/368/845

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...$\rm H_2O$masers

Note that Comoretto et al. list 505 H₂O sources. However, five of them (HH7-11(B), M17(6), S88, IRAS 09353+0319, BFS 11(A)) are at a distance of less than 1 arcmin from another source and should not be considered as separate entries.

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... 213 sources

U1 contains 214 sources, but one of them (IRAS 18144-1723) is already present in Comoretto et al. (1990).

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... 712 masers

With the criterion on distance defined in note 1, the merging of Comoretto et al. (1990) and U1 catalogs produces 712 independent entries in the Catalog instead of 713.

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