# 📐 L2 Spec — Acoustic Emission — source localization Mismatch-Only Spec
**ID:** `L2-267-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-267`](/artifact/l1/L1-267)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554053
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | -5 – 40 |
| Fs mhz | MHz | 0.1 – 40 |
| N events | — | 10 – 10000 |
| N sensors | — | 4 – 128 |
| Anisotropy | — | 0.0 – 0.3 |
| Pick time error | — | 0.0 – 10.0 |
| Sensor pos error | — | 0.0 – 0.05 |
| Wave speed error | — | 0.0 – 0.1 |
## 2. Tolerance (ε)
**Type:** `fn`
```
2.0 + 100.0*sensor_pos_error + 30.0*wave_speed_error + 0.5*pick_time_error + 10.0*anisotropy
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`00e91f39e0ee219e34d2a33e3cc924736fb2b578de4f983737900ba53d558147`
## 5. On-chain Registration
- **Chain hash:** `0x1e50f3dd0f7b8c53b0f6d8d2dfd9bef7c70198afc366d61722767e71338f98c4`
- **Chain tx hash:** `0xacb246e5615fcb089fb4768c50b25389946860d4ba0e1834f9abb0e290491f7d`
- **Chain block:** `41554053`
---
## File Mapping
This bundle consists of: `L2-267-001.md`, `L2-267-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-267-001.md` | Source of truth — edit this | Human or LLM |
| `L2-267-001.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 `L2-267-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._