Why do CCS cost estimates disagree so much?

Cost arguments get messy fast because people mix captured CO2, avoided CO2, first-of-a-kind plants, nth-of-a-kind plants, transport, storage and financing into one tidy dollar figure.

Rubin's pitfalls paper is still a clean warning label: doi:10.1016/j.ijggc.2012.06.004. Rubin et al. on methodology is useful for standardizing estimates: doi:10.1016/j.ijggc.2013.06.004. Learning rates add another layer: doi:10.1016/j.enpol.2015.06.011.

What one table should every cost estimate include before we take it seriously?