interpreting the cpu data from the process plugin

[npomfret]

@MrRio was hoping you could advise me on using this package as a lib rather than a gui. I wan't to periodically log some CPU stats, which is fairly easy to do (thanks!). I'm just trying to understand the output a little. Here's an example of some:

{
  Command: 'Google Chrome Helper (Renderer)',
  Count: 18,
  'CPU %': '0.8',
  'Memory %': '7.3',
  cpu: 4.5,
  mem: 7.3
}
{
  Command: 'com.apple.WebKit.WebContent',
  Count: 41,
  'CPU %': '3.7',
  'Memory %': '26.9',
  cpu: 22.100000000000005,
  mem: 26.900000000000002
}
{
  Command: 'node',
  Count: 6,
  'CPU %': '1.2',
  'Memory %': '1.6',
  cpu: 7,
  mem: 1.6
}
{
  Command: 'webstorm',
  Count: 1,
  'CPU %': '0.9',
  'Memory %': '8.5',
  cpu: '5.6',
  mem: '8.5'
}

My question is, what's the difference between CPU % and cpu?