This table is used as an inverse temperature correction. So, raising the values will lean it out, lowering the numbers will add fuel.
The values within this table are in degrees Kelvin, but the column headings are in degrees Celsius. Don't know why, that's just the way GM designed the software.
BTW, a degree Kelvin is the same "size" as a degree Celsius, the scales just start a different points: 0 K = -273 C .