There's Trouble on the Way

Exposure compensation was -2. I have no idea what the weird Exposure Bias numbers below refer to.--Landrum Kelly

Exposure Date: 2010:05:28 17:27:38;
Make: Canon;
Model: Canon EOS 5D Mark II;
Exposure Time: 1/8000.0 seconds s;
FNumber: f/4.0;
ISOSpeedRatings: ISO 800;
ExposureProgram: Other;
ExposureBiasValue: +-20/6
MeteringMode: Other;
Flash: Flash did not fire, compulsory flash mode;
FocalLength: 100.0 mm mm;
Software: Adobe Photoshop CS2 Windows;