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By default, Guide only installs a few megabytes of essential data to the hard drive, and the remainder of the data it needs is read from the DVD on an "as-needed" basis. This is fine for many uses, but there are several possibilities for installing more data, or the entire DVD, or bits and pieces of the DVD, to the hard drive. To see this, click on "Extras... Install to Hard Drive". Guide will give a list of assorted items that can be installed from the hard drive. If you just checked the first item, "Minimum Hard Drive Install", Guide would copy over a few more megabytes that would be enough to let you run the program without needing the DVD. But it would be a very "minimal" installation: you would see no stars past magnitude 7.0, many datasets would not be included, and many functions would be unavailable. Checking subsequent items soaks up added hard drive space, but gives you those added functions. Check all the items, and Guide will copy over everything from the DVD, consuming about 2.5 GBytes. (Of course, you can return later and un-check some or all of these items to reclaim the hard drive space.) Guide will still check the DVD drive at startup, just to see what data is available. If you've installed only a few items, but Guide realizes the Guide DVD is in the drive, it will get what it can from the hard drive and access remaining functions and data from the DVD. By default, the DSO images appear whenever you center on a deep-sky object at a field of view smaller than 1.6 degrees. They are displayed much as if they were RealSky or DSS images, and are controlled through the "Extras... DSS/RealSky Images" dialog described on page 54. Be warned that there are tens of thousands of images provided; if you attempt to show all images covering, say, a 20-degree field of view, it will take a long time for Guide to show them all. This is the main reason that the images are, by default, only shown up to a 1.6-degree field of view. 17d: ASTEROID OPTIONS The Asteroid Options dialog provides some extra controls over how asteroids are shown. You can access it through the Extras... Asteroid Options menu item, or by right-clicking on an asteroid, then on Display, then on Options. The options listed are: Asteroid Labels: ( ) Label by number ( ) Label by number/prov ( ) Label by name/prov [ ] Use MPCORB Add MPC Comets/Asteroids Edit Comet Data Trail length (in days):
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