# 📐  L2 Spec — Magnetoencephalography (MEG) Mismatch-Only Spec

**ID:** `L2-067-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-067`](/artifact/l1/L1-067)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553376

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N time | — | 1000 – 1000000 |
| Snr db | dB | 0.0 – 30.0 |
| N sensors | — | 64 – 1024 |
| Sampling hz | Hz | 100 – 10000 |
| Head movement | — | 0.0 – 0.3 |
| Sensor crosstalk | — | 0.0 – 0.3 |
| Signal space leakage | — | 0.0 – 0.3 |
| Environmental interference | — | 0.0 – 0.5 |

## 2. Tolerance (ε)

**Type:** `fn`

```
5.0 + 0.3 * SNR_dB - 10.0 * environmental_interference - 8.0 * head_movement - 6.0 * sensor_crosstalk
```

## 3. Difficulty

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

## 4. Fingerprint

`562d050fac1497646181b479794bc26d916d3557b01a30387978e58f8ae6876d`

## 5. On-chain Registration

- **Chain hash:** `0x351c02a7bf367d7f51df85f0e4926f0e39c3a5a292b49ff0c746a430f9ad2c21`
- **Chain tx hash:** `0xe5e85e1b35ffbff364a385e737a7a15f46ebee937339402a48711d7fb5f5a274`
- **Chain block:** `41553376`

---

## File Mapping

This bundle consists of: `L2-067-001.md`, `L2-067-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-067-001.md` | Source of truth — edit this | Human or LLM |
| `L2-067-001.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 `L2-067-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._