Figure 1
Two Representative IRIS Spectra of Callisto. Voyager~1 spectra, plotted
both in `raw' form using radiance ($\mu$W/cm2/sr/cm-1), and converted to
brightness temperature, TB. On the TB plot, plotting is continued to large
wavenumbers until the first occurence of a negative radiance. This figure
demonstrates the larger useful wavenumber range of warmer spectra. The
warm spectrum is 16421.59 and the cooler one is 16425.22