Diff of /PDL/Book/FirstSteps.pod [b8d074] .. [cdc763] Maximize Restore

  Switch to side-by-side view

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 fat the profile is across when it drops by half. Looking at Figure 1.6
 it looks like this is about 2-3 pixels - pretty compact!
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 Figure 1.6: Radial light profile of the bright star with fitted curve.