I do not seem to have provided a link in this thread but yours goes to a technical writing guide. Here is a link to the Technical Summary of IPCC's Working Group I's report, "The Physical Science Basis". It is a large PDF you can either download or read online.
https://www.ipcc.ch/report/ar6/wg1/downloads/report/IPCC_AR6_WGI_TS.pdf. Commit to memory the beginning of that URL: ipcc.ch. It will take you far. Once you have the PDF open, you can easily get to Chapter 6.
My comment about the calculation of forcing factors was simply telling you what was clearly stated in the caption of the forcing factor graphic I posted which you seemed unable to read by yourself. I pointed it out to inform you that the data from the graphic did NOT come from a laboratory experiment so that you would understand that - with that graphic - I was NOT attempting to answer your demand to be shown 80 year old science.