Exercise $4\mathrm{.}8$: how can we focus attention here?

You've practiced focusing attention with tables and lines; next let's take a stab at doing the same with bars.

Let's revisit an example from Chapter $2.$ Imagine you work for a regional health care center and want to assess the relative success of a recent flu vaccination education and administration program across your medical centers. Figure $4\mathrm{.}8$ is a slightly modified version of the original graph.

Let's assume we want to direct our audience's attention to those medical centers that are above average. In what ways could you use preattentive attributes to do so$?$ How many different methods can you come up with to focus your audience's attention? List them!

MEDICAL CENTER

FIGURE $4\mathrm{.}8$ How can we focus attention on above average medical centers?