S/N ratio and a variety of line profiles. The parameters of the emission given in Table 1 refer to the integrated line intensity ($I$), the heliocentric systemic velocity in CO ($V_{\rm o}$), the line width at zero intensity ($\Delta V$), and the peak line temperature ($T_{\rm p}$). In the spectra where the S/N ratio is sufficiently high that the profile shape can be discerned, $I$ is obtained by direct integration of the profile, $V_{\rm o}$ is estimated where possible from the symmetry of the line (e.g., the average velocity of the peaks of a double-peaked profile), and $\Delta
V$ and $T_{\rm p}$ are determined by inspection; because the intrinsic profiles are unknown, larger values of $\Delta V$ from broad wings at or below the noise level of the spectra cannot be ruled out. In the spectra with low S/N where the profile shape cannot be discerned, the parameters are obtained by a Gaussian fit to the line; the line width given in Table 1 is the FWHM, and it is given as a lower limit to $\Delta V$.

Comments on Individual Spectra
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Here we comment on the individual spectra in Fig. 1, point out IS features that appear in 