# 📐  L2 Spec — Diffuse Optical Tomography (DOT) Mismatch-Only Spec

**ID:** `L2-040-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-040`](/artifact/l1/L1-040)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553388

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 0.0 – 35.0 |
| Motion | — | 0.0 – 0.3 |
| N sources | — | 8 – 256 |
| Lambda nm | nm | 650 – 900 |
| N detectors | — | 8 – 256 |
| Partial volume | — | 0.0 – 0.5 |
| Tissue scattering | — | 5.0 – 20.0 |
| Source distance cm | — | 1.0 – 10.0 |
| Anatomical prior error | — | 0.0 – 0.5 |

## 2. Tolerance (ε)

**Type:** `fn`

```
10.0 + 0.3 * SNR_dB - 12.0 * anatomical_prior_error - 10.0 * partial_volume
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |

## 4. Fingerprint

`4d861e683caa524185604b3439f8dfd6e48ed6abd72ecc11b2077004789626e2`

## 5. On-chain Registration

- **Chain hash:** `0x8bb8bbe90962c038574c0a6abd33947423e7c2d743fe9610112c42f2cfc3191f`
- **Chain tx hash:** `0x2219bd8929f4ce508d4dcc4de4af7032477768b239be9bd8c9ec60b087566e67`
- **Chain block:** `41553388`

---

## File Mapping

This bundle consists of: `L2-040-001.md`, `L2-040-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-040-001.md` | Source of truth — edit this | Human or LLM |
| `L2-040-001.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 `L2-040-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._