# UTFANSWF v21 — Row 20 Ladder-Side Probe

**Context:** DIAGNOSTIC_NON_GATING. No physics, thresholds, datasets, parameters, or gate verdicts changed.

## SN block

| Quantity | Value |
|---|---:|
| chi2 | 11.093326 |
| dof | 2 |
| chi2/dof | 5.546663 |

## SN nuisance handling

```json
{
  "SN_M_fit_existing_offset": 2.115928369672133
}
```

## Ranked SN nodes

| Rank | Slice | data | theory | residual | pull sigma | chi2 contribution |
|---:|---|---:|---:|---:|---:|---:|
| 1 | SN mu z=0.35 | 43.100000 | 41.573176 | -0.589104 | -2.634554 | 8.445196 |
| 2 | SN mu z=0.70 | 44.200000 | 41.749589 | 0.334483 | 1.365521 | 1.864647 |
| 3 | SN mu z=0.10 | 42.000000 | 39.707042 | 0.177029 | 0.885146 | 0.783483 |

## SH0ES overlay

| Quantity | Value |
|---|---:|
| H0_SH0ES | 73.040000 |
| sigma | 1.040000 |
| pull sigma | -5.423077 |
| chi2 | 29.409763 |

## Interpretation

- SN relative block is already stressed before SH0ES is added.
- SH0ES overlay is a strong high-side H0 outlier relative to the v21 baseline.
- The ladder-side problem is not only the SH0ES overlay; the SN midpoint node also carries significant residual structure.

## Verdict

ladder_side_structured_tension; diagnostic only; no physics, thresholds, datasets, parameters, or gate verdicts changed.
