CO ice spectra toward source #2 (17312818−2631268) recorded by NIRSPEC spectrograph. The black plot is the spectra binned by 21 pixels from the original sampling, and the gray plot by 11 pixels. The observed spectra shown in the three panels are identical. The laboratory spectra of CO ice obtained by Palumbo & Strazzulla (1993) are overlaid in red, dark orange, and light orange in each panel. The top panel shows the spectrum of CO ice deposited by itself, the middle panel CO ice deposited with CO2, and the bottom panel CO ice embedded in water ice. The dotted gray lines are the assumed continuum level with zero optical depths. The region marked in light gray indicates where the continuum level is uncertain.
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