Of course, K proportional can be factored out, and we will cancel out b additive , which yields equation 6 and leads directly into the correction method proposed in this work. It is possible that the additive error for the system of interest is not the same as that of the reference state, and therefore the two b additive values in equation 5 may not be exactly equivalent; however due to the error cancellation effect described in the previous section, the portion of the additive error that does not cancel out would likely appear as another proportional error. Therefore, to a first order approximation, such errors can also be modeled by K proportional once it is factored out, as shown next.