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Response to Jaber and Bonneys' comments As acknowledged in Jaber and Bonney's (JB) response, 1 the two major issues are: (1) Is the JBM 2 model correct? (2) Do JBM and ZLM 3 produce different results? On the ®rst issue, JB 1 do not refute our claim that the original JBM 2 is mathematically incorrect, but justify it by pointing out that an`approximation' disclaimer was explicitly stated in their paper. We therefore would like to retract our claim that the original JBM is incorrect, and would merely state that our model 3 removes thè approximation' in JBM. On the second issue, JB 1 do not refute our claim that the ZLM exact expression is hardly more complicated than JBM's 2 approximate expression, but they present more than one page of mathematical derivations to reach the conclusion that`Arguably, in most practical cases, (the ZLM and JBM expressions differ by) a negligible value.' We do not see the need to disagree with this conclusion.