Table 1: Derived upper limits on O2 column density relative to H2. The 1 channel rms noise is given in the $T_{\rm A}$ scale, but all computations have been done assuming a 90% coupling to the main beam. Resolution is 0.3 km-1 except for G0.26-0.01 (2.5 km-1). 6.8(14) means $6.8 \times 10^{14}$. The "Ref.'' column provides references for the C18O data.
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(a) Core only: $2\hbox{$^\prime$ }\times 3\hbox{$^\prime$ }$; (b) No extended C18O measurements available; (c) Line of sight towards G0.26-0.01, containing many clouds
over a large velocity range; (d) From 13CO, N(H2) $\approx$ 1023 cm-3; (e) $\leq$ $1.7 \times 10^{-7}$ C18O core only.
Refs.: (1) Onishi et al. (1996), (2) Dutrey et al. (1996), (3) Aoyama et al. (2001), (4) Pagani et al. (2001), (5) Tachihara et al. (2000),
(6) Kraemer & Jackson (1999), (7) Schwartz et al. (1989), (8) Dickel et al. (1977), (9) Dahmen et al. (1997), (10) Dahmen et al. (1998),
(11) Ando et al. (2002), (12) McMullin et al. (2000), (13) Churchwell et al. (1992), (14) Matthews et al. (1987), (15) Little et al. (1994),
(16) Kim et al. (2001).

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