https://docs.emtronaustralia.com.au/engine-management/emtune/math-expressions/index.htmlA user definable mathematical equation that allows the user to generate channels for data analysis or to aid in rapidly validation tuning data. The expression is defined by a single line of text that can include most common mathematical operations and many advanced functions. In the above example, the expression cv - (if(abs(a) < 100, b, 0)) is used. When the Q key is pressed, the expression takes the current table cell value cv and subtracts Engine Torque (Uncorrected) b, but only if the absolute Derivative Engine Speed a is less than 100 RPM/s, otherwise it subtracts nothing. This means it will automatically fill in the frictional loss table for you but it makes sure the engine speed is stable.Hugoen-us