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Contribution = weight × Δspread; the sum equals the tier's weekly change exactly.
| Constituent | Rating | Spread | Δ 5D | Δ 30D |
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| Date | Composite | Δ | HY | Δ | IG | Δ |
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Premium = NCSX tier level − broad-market same-tier spread; the composition snapshot shows where the risk actually sits.
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| Issue | Coverage | Composite | Δ 5D |
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