All Figures

	Figure 1: An overview of all observations. Data are plotted directly in antenna temperatures, i.e. are not corrected for forward and main beam efficiencies, or Neptune's filling factor. Black: Aug. 15, 2003. Blue (dashed line): Sep. 1, 2004. Red: May 12, 2004. Green (dashed line): May 13, 2004. The absorption near 231 280 MHz is due to telluric ozone.
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In the text

	Figure 2: Models of the total CO line with uniform CO mole fraction. Data: solid black lines. Models ( from top to bottom): red: CO = 1.0 ppm; green: 0.8 ppm; dark blue: 0.5 ppm; light blue: 0.3 ppm.
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In the text

Figure 3: Models with altitude-varying CO mixing profiles. Light blue (label S): CO restricted to p< 100 mbar with 1.0 ppm mole fraction. Green (label 2L): two-level model, with CO = 1.0 ppm at p< 20 mbar and CO = 0.5 ppm at p> 20 mbar. Red (label Pa): physical model, with CO = 0.5 ppm in deep troposphere, an external flux of  cm-2 s-1and the eddy diffusion profile "A'' of Romani et al. (1993). Dark blue (label Pb): same, but with the eddy diffusion profile "B'' of Romani et al. The corresponding CO and eddy K profiles are shown in the insets. The decrease of CO at p< 0.001 mbar is due to molecular diffusion.

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In the text