Table 5: Fractional abundances with respect to H2, for some observed hot coresa.
Species   Orion Compact Ridgeb Orion Hot Coreb IRAS 16293c IRAS 4Ad
HCOOCH3-A   3(-8) 1.4(-8) $1.7 \pm 0.7(-7)$ $3.4 \pm 1.7(-8)$
HCOOCH3-E       $2.3 \pm 0.8(-7)$ $3.6 \pm 1.7(-8)$
HCOOH   1.4(-9) 8(-10) $\sim$6.2(-8) $4.6 \pm 7.9(-9)$
CH3OCH3   1.9(-8) 8(-9) $2.4 \pm 3.7(-7)$ $\leq$2.8(-8)
H2CO   4(-8) 7(-9) 6.0(-8)e 2(-8)f
CH3OH   4(-7) 1.4(-7) 3.0(-7)e $\leq$7(-9)
a $a(b) = a \times 10^{b}$. b Values from Sutton et al. (1995). Values are given for total HCOOCH3 abundance. c Values from Cazaux et al. (2003). d Values from Bottinelli et al. (2004). e Values from Schöier et al. (2002). f Values from Maret et al. (2004).

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