If you have used the log stats screen on the tool before, you may be able to workout how to use this:
Open Loop Additive Tool
For best results:
Set the cell range to ~20% on the define axis screen and paste in your OL Additive table as the axes.
Filter dV/dt to 0.3 or less, you'll need to add a column for dV/dt to your logs. The formula can be found
here.
Filter Fuel System Staus = 2 (Open Loop Only)
Filter error <17.5% which will remove anywhere where you're off throttle and AFR is showing ~20:1
You'll need to creata a column called Error % into the log too, which is where you'll get the data. The formula is also in my spreadsheet