September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Downstream HO2S Graph Line Example 1
WARNING: This page is about a different car, the 2004 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
Equation
RATIO = 30 inversions (upstream HO2S inversions) / 5 inversions (downstream HO2S inversions) = 6.0 (good WU-TWC)
Courtesy of MAZDA MOTORS CORP.