# 📐 L2 Spec — Electrical Impedance Tomography (EIT) Mismatch-Only Spec
**ID:** `L2-066-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-066`](/artifact/l1/L1-066)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553362
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 512 |
| W | px | 32 – 512 |
| Drift | — | 0.0 – 0.3 |
| Snr db | dB | 0.0 – 40.0 |
| N patterns | — | 4 – 128 |
| N electrodes | — | 8 – 256 |
| Electrode contact | — | 0.3 – 1.0 |
| Noise amplification | — | 0.0 – 0.5 |
| Model geometry error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
6.0 + 0.3 * SNR_dB + 6.0 * electrode_contact - 10.0 * model_geometry_error - 12.0 * noise_amplification
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`1dd98ce620284e4cddfc41bdb7fb9837bda37edfd9b0febbe6a98c596322818a`
## 5. On-chain Registration
- **Chain hash:** `0x7484b09d1520ba62c4e96b2337e9e83cddfdc67ee430023a1f16a03b89ae4503`
- **Chain tx hash:** `0x0a04562a286e26ac36869f2c376f5348236281a74de9aa40d5a2f9015adb6605`
- **Chain block:** `41553362`
---
## File Mapping
This bundle consists of: `L2-066-001.md`, `L2-066-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-066-001.md` | Source of truth — edit this | Human or LLM |
| `L2-066-001.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 `L2-066-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._