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In this paper, we revisit the problem of using gravitational wave data to test the Einstein-dilation-Gauss-Bonnet theory by using nine selected gravitational wave events from the third Gravitational-Wave Transient Catalog. Compared with existing work, we take into account the higher harmonics more properly and we also study the contribution of the merger-ringdown data. Using the inspiral data alone, we find that the best result is from GW200115, giving ||<1. 1 km, which is about 17% tighter than the previous best result. Several combinations of the selected events give ||1. 0 km. The result is further improved when the merger-ringdown data are also included, using two phenomenological schemes, giving ||<0. 87 km for GW200115 in the best case scenario. We also notice the possible existence of a simple unexpected relation among the constraints from different events, and it is important to have more large mass ratio events that can help clarify if there is indeed such a trend.
Wang et al. (Fri,) studied this question.