To do so we assume that all anthropogenic forcings except indirect aerosol forcing are given their central values, and consider a range of values for the reference (2005) indirect forcing amount. (link.springer.com)
The effect on radiative forcing of assuming different values for indirect aerosol forcing. (link.springer.com)
The bottom three curves show the history of indirect aerosol forcing used in the top three curves. (link.springer.com)