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3. In the Marks card, open the panel for Latitude (generated) (2) and change the
Mark type from Automatic (or Filled Map) to Shape .
4. Still in the Marks card area for Latitude (generated) (2) , remove AVG(B: In-
ternet users (per 100) from the color shelf and add B: Internet users (cal-
culated) to the Size shelf.
5. Use the Color and Size cards to change the color of the rings to a darker gray and in-
crease the size of all of the rings to produce the final dual-axis map shown in Fig-
ure 10-21 .
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