Data for "Strong long-wavelength electron-phonon coupling in Ta2Ni(Se,S)5"

The data deposited here are grouped into the following categories: 1. Inelastic x-ray diffraction: Measured at the 30-ID HERIX beamline at the Advanced Photon Source, Argonne National Laboratory. Used to generate figures 2, 3, 4, S2, S3, S4, S5, S6, S7 and S10. 2. XRD and diffuse signal: Measure at Beamline QM2 of the Cornell High Energy Synchrotron Source. Used to generate figures 4 and S1. 3. DFT data: first principles calculation data. Used to generate figures 2, 3, S9, S10 and S11.