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effect by changing the "saturation" value.  It defaults to 100%,
full color saturation.  Turn it to,  say,  50%,  and the stars will
appear to be somewhat more realistically colored.

   The "blurring" option is another gesture toward realism.  Set it
to a non-zero value,  and Guide will draw stars with softer edges,
making them look a little more circular.  A value of 1 to 3 is usually
considered visually pleasing.  As with many of the settings in this
dialog,  though,  your personal preferences may be very different.

7b:  The Data Shown dialog                      

   First,  a very important tip:  if you see an object on the
screen, and wish to turn it off,  or change its color,  or change
the fields of view at which it is displayed,  the simplest thing
to do is almost always to just click on it with the right mouse
button.  You will get a small dialog box describing that object,
and a "Display" button. Clicking on this will lead you to the
controls for that type of object. (For example,  right-click on a
galaxy,  then on "Display", and you can adjust such things as the
limiting magnitude for display of galaxies.)

   This is an immensely simple and powerful way to deal with objects
that are being shown on the screen.  But if galaxies (for example) are
currently turned off,  you're obviously unable to click on one in
order to turn galaxies on.  In such cases,  you need to use the Data
Shown dialog.  It's also convenient if you want to change the display
of many types of object at once.
                                                     
   In the Data Shown dialog,  you are given a list of fifteen classes of
objects controlled by the Data Shown menu/dialog:

Messier
NGC + IC
Galaxies
Nebulae
Planets
Variables
NSV
Open clusters
Asteroids      
Gal Clusters
Comets
Globulars
Planetaries
Dark Nebulae
Satellites

   Each object class is followed by buttons to turn that class "on",
"off",  "auto",  or "fixed".  When a particular class of objects is
turned On,  all objects of that class will be shown, regardless of

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