Research Data Supporting: Ultrafast melting and recovery of collective order in the excitonic insulator Ta2NiSe5

This data includes that which is shown in the main text figures 1-4 of the associated publication. We have used pump-probe measurements to investigate the ordered phase in excitonic insulator candidate, Ta2NiSe5. The measurements are performed with a single pump, and two pump configuration (also sometimes called pump-push-probe). While all the data shown is taken in reflection, we did similar measurements also in a transmission configuration.