# 📐 L2 Spec — Susceptibility-Weighted Imaging (SWI) Mismatch-Only Spec
**ID:** `L2-059-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-059`](/artifact/l1/L1-059)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553375
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 |
| W | px | 128 |
| Z | — | 16 – 256 |
| Te ms | ms | 10 – 80 |
| Snr db | dB | 0.0 – 35.0 |
| Phase wrap | — | 0.0 – 0.3 |
| B0 inhomogeneity | — | 0.0 – 0.3 |
| Coil phase error | — | 0.0 – 0.3 |
| Air tissue boundaries | — | 0.0 – 0.5 |
## 2. Tolerance (ε)
**Type:** `fn`
```
16.0 + 0.3 * SNR_dB - 10.0 * B0_inhomogeneity - 6.0 * air_tissue_boundaries - 5.0 * phase_wrap
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`acf319b59f53a7b2e9c568ff424a1b4626bb2277d8aed60c14b4ba8b80472462`
## 5. On-chain Registration
- **Chain hash:** `0x1ff950aa2b06d1dd7da98c5ca347f7434aa7ff23d0015927794f3f11a2b6d8b1`
- **Chain tx hash:** `0xe01113e39f8e9aeafee96506d7d5008fa057bf2d46d8b429c36a05da373dbafc`
- **Chain block:** `41553375`
---
## File Mapping
This bundle consists of: `L2-059-001.md`, `L2-059-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-059-001.md` | Source of truth — edit this | Human or LLM |
| `L2-059-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-059-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._