Here's what it looks like in action.
Warning: If for any reason you decide that you want to replace the OS X System Font on your own please use caution to remove it before upgrading to OS X 10.11. Apple was quick to DMCA the Github repository that had the font because if the new font isn't removed as a system font when the user upgrades to 10.11, Apple's replacement font will not show up. Messing with system fonts is really nasty and can ruin your experience.
Warning: If for any reason you decide that you want to replace the OS X System Font on your own please use caution to remove it before upgrading to OS X 10.11. Apple was quick to DMCA the Github repository that had the font because if the new font isn't removed as a system font when the user upgrades to 10.11, Apple's replacement font will not show up. Messing with system fonts is really nasty and can ruin your experience.

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