In principle, total number of replicate injections should be 6. However, in the case that a long time is necessary for one analysis, such as the analysis using the gradient method, or the analysis of samples containing late eluting components,it may be acceptable to decrease the number of replicate injections by adopting new allowable limit of ``System repeatability'' which can guarantee a level of ``System repeatability'' equivalent to that at 6 replicate injections.