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At the top left are a number of options that tell the tree what to display -- the number of generations, picture thumbnails, icons for attached documents and discussion posts, and options to show more details. The tree will refresh whenever any option is changed, and should be remembered whenever you return to other pedigrees in the future.
Clicking the arrows on the right expands the tree with more generations. Then within the new branch that displays, clicking the X in the upper left closes that branch.
Clicking a name brings up a menu of choices -- going to the individual page for the person, redisplaying the pedigree starting with that person, or displaying descendants of that person.
The background color of each person corresponds to the county, state, and country of the person's birthplace. Each color is identified at the bottom of the page. If the place is not known, or does not have a corresponding color, it shows in gray.
Tip: When viewing more generations than will appear on your screen, use the browser's Zoom function to zoom out (Ctrl + minus in FireFox 3+ and I.E. 7+). This makes everything smaller. Even if you are not able to see the text, but you would still be able to see the colors.
This shows up to 15 generations of a person's ancestors summarized by a percentage of birthplaces, over the total number of people of that generation. For most people, the "Unknown" percentage will dominate the distant generations, as the exponential number of ancestors swallows the smaller number of ancestors defined... but it should be interesting, nevertheless.
Another reason to fill in those blank birthplaces wherever possible. Clicking any "Blank" will open a search results list with those people, so you can look through them and see if any can be filled in.