APPENDIX to Approximations for Heavily - Loaded G / GI / n + GI Queues

This appendix supplements the main paper by providing additional numerical examples evaluating the performance of the Gaussian approximations DGA, TGA and TGA-G. First, in §B, we give more examples providing examples of the good performance. Then, in §C, we give more examples that further expose the limitations of the approximations. In §C.1 we give examples showing that the abandonment rates cannot be too much larger than 1; otherwise the system ceases to be OL. In §C.2 we give more examples showing that the performance of underloaded models is not good except for a few performance measures. Here we consider models with smaller scale. In §C.3 we give examples showing the degraded performance of the approximations when the traffic intensity ρ is too close to 1. We fix n = 100 and let ρ decrease toward 1.