Supplementary Online Material

The supplementary material contains additional data and discussion on the correlation functions and memory kernels involved in the IOMK-GN method (Sec. S1), the validity of Eq. 19 (Sec. S2), details on the evaluation of matrix expo- nentials (Sec S3), additional informations on the comparision of the two regularization schemes and different tests on the effects of the strategies described in the Appendix (Sec. S4).