Before I comment, I'd like to see the O2 content. This looks like the California developed acceleration simulation mode (ASM) test, and our reports list the O2 content, which is an important diagnostic tool.

Also, what is the odometer reading?

I don't know what is meant by "dilution". It might be defined on your test report. The web site for your state agency that administers the emission test program will probably have a definition and more information on how to iinterpret the report.

Duke