This repository contains supplementary data to the paper "Large scale voxel-based FEM formulation for NMR relaxation in porous media", which is being considered for publication. The files are:**_data.zip - Binary image files; FEM_T2_**.csv - T2 simulation results using finite elements; FEM_**_inv.csv - T2 inversion for the finite element simulations; RW_T2_**.csv - T2 simulation results using random walk; RW_**_inv.csv - T2 inversion for the random walk simulations; local_digital_correction.c - Vector containing the local geometry correction factors, accessed integers formed by the 8-bit binary key of the node neighborhood; Where ** is the rock type: AC - Austin Chalk BS - Berea Stripe DP - Desert Pink IB - Idaho Brown Obs.: in order to obtain the relaxation curves the following parameters were utilized in the simulations: Bulk diffusivity: 2500 micro-m2/s (all rock samples) Bulk relaxation: 2.6 s (all rock samples) Voxel size: {1.0; 2,0; 0.9; 2.0} micro-m (for AC, BS, DP, IB respectively) Surface relaxivity: {23.3; 12.1; 12.3; 8.3} micro-m/s (for AC, BS, DP, IB respectively)