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calculation of errors by common mode voltage and reference voltage

Category: Datasheet/Specs
Product Number: AD8418A

I'm trying to calculate errors by common mode voltage and reference voltage.

Output voltage error, ΔVo by common mode voltage should be calculated by

ΔVo=G*1/10^(CMRR/20)*ΔVcm

ΔVcm:=Vcm - Vcmo

Specsheet says CMRR (f=dc to 10kHz) = 86dB, but what is Vcmo?

Output voltage error by reference voltage should be calculated by

ΔVo2 = δ * ΔVref

ΔVref:=Vref - Vrefo

δ is accuracy and I'm going to apply the same volatage to Vref1 and Vref2, so δ = +/-1. What is Vrefo?