This PDF file includes:

• section S1. Time- and angle-resolved photoemission spectroscopy.
  
• section S2. Time- and angle-resolved photoemission spectroscopy: Difference spectra.
  
• fig. S1. Time- and angle-resolved photoemission spectroscopy.
  
• fig. S2. Time- and angle-resolved photoemission spectroscopy: Difference spectra.

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