This PDF file includes:

• Supplementary Text
• Fig. S1. A time sequence of snapshots of electron density fluctuations.
• Fig. S2. Comparison of PIC simulations without and with e-e collisions.
• Fig. S3. Relaxation of nonthermal plasma due to Coulomb collisions.
• Fig. S4. Recurrence of the streaming mode and the fixed phase relationship between the streaming and the filamentation modes.

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