Each effect is given in terms of its impact on the mean airborne fraction over the simulation period (typically 1860 to 2100), with bars showing the uncertainty range based on the ranges of effective sensitivity parameters given in Tables 7.4 and 7.5. (ipcc.ch)
Is effective sensitivity a better constraint for the TCR? (realclimate.org)
Is the effective sensitivity visible over the last 100 years the same as the equilibrium sensitivity? (realclimate.org)