Thanks! Strange thing I noticed looking at SOFR/ED spreads on Reuters. The inter-contract spreads had the same expiries (Z/Z, H/H, etc). But SOFR is averaging a realised rate and ED is forward looking. Looking at the correlations for example Dec SOFR contract vs Sep ED is a touch higher than Z/Z or U/U. So that would make sense. So, if I am right, SR3U20/Z20 would correspond to GEM20/U20. Or am I somehow mistaken?