achieve 1-microarcsecond narrow-angle accuracy) or Gaia[@perryman] could provide important supplementary data to aid in the interpretation of direct detections of EGPs.

As Saturn itself demonstrates, depending upon orbital orientation, planetary rings can greatly augment reflected light [@dyudina; @arnold]. Their possible presence is a wild card in the interpretation of direct EGP signatures. Also, since $\Phi({\alpha})$ is wavelength-dependent, the potentially large variation in reflected optical flux with epoch will be complemented by an interesting variation in color. The phase functions $\Phi({\alpha})$ are wavelength-dependent. For example, planets should execute trajectories in the color-color space $V-R$ vs. $B-V$, where $B$, $V$, and $R$ are the standard blue, visible, and red bands. These trajectories will be functions of cloud particle size, among other things, and will be useful atmospheric diagnostics. Similar behavior in the near- and mid-infrared colors, though more modest, may be seen.

Ground-based and Space-based Telescopes for Direct Detection {#telescopes}
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As Fig. 2 implies, the wide range of planet/star contrast ratios and spectral diagnostics suggests different technological solutions to direct detection. Furthermore, the relative merits of searching in the optical, near-infrared, or the mid-infrared have yet to be determined. Both ground-based (less expensive) and space-based (more capable) paths are being pursued 