This PDF file includes:

• Additional Low-Temperature Measurements
• Data from Additional Samples
• Fig. S1. Low-temperature measurements of sample 2A-1 with additional filtering.
• Fig. S2. Data from sample 2A-1.
• Fig. S3. Data from sample 2A-2.
• Fig. S4. Data from sample 2A-3.
• Fig. S5. Data from sample 3A-3.
• Fig. S6. Data from sample 4A-1.
• Fig. S7. Data from sample 4A-2.

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