A right-aligned tab allows you to align all subsequent text to the right edge of the text frame. You won't find it in the Tabs palette, but under the Insert Special Character menu. Alternatively you can press Shift-Tab in the text. To use a Right Indent Tab with a tab leader (CS2 only), set a tab stop anywhere in the paragraph and apply a leader character to it. When you press Shift-Tab the leader character will appear.
Figure 12.7. A Right Indent Tab (Shift-Tab) is inserted before the attribution to align the author's name to the right column edge.