Matlab .fig files, which include numerical computational data, for Figures 1, 3 and 6 in the manuscript titled "Heterogeneity-Induced Oscillations in Active Nematics" by A.J.H. Houston, M. Grinfeld, G. McKay, N.J. Mottram. Fig 1 subplots Fig1a.fig Fig1b.fig Fig1c.fig Fig1d.fig Fig 3 subplots Fig3a.fig Fig3bcd.fig Fig 6 subplot Fig 6b uses the data from Fig3a