# 📐  L2 Spec — Event Horizon Telescope (VLBI) Imaging — Nominal + Mismatch Specs

**ID:** `L2-168-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-168`](/artifact/l1/L1-168)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554247

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 512 |
| W | px | 32 – 512 |
| N baselines | — | 6 – 50 |
| Uv fraction | — | 0.0001 – 0.01 |
| Noise sigma jy | — | 0.01 – 1.0 |

## 2. Tolerance (ε)

**Type:** `fn`

```
1.0 + 0.2 * (N_baselines / 15) ** (-0.5)
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |

## 4. Fingerprint

`9c67a7f6bf4f035bb15c8bc8e0debb7bf41dba0f3a2243fdf555cff7b64344e4`

## 5. On-chain Registration

- **Chain hash:** `0x204497f597876892bbd9d3f6cbe78658eea31ff2f5e07fcb99e5424d43650f48`
- **Chain tx hash:** `0xe80bda525603c8cc65beb1978c76607edf8042bd3c7a70dad8e7bd0abb5a80ab`
- **Chain block:** `41554247`

---

## File Mapping

This bundle consists of: `L2-168-001.md`, `L2-168-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-168-001.md` | Source of truth — edit this | Human or LLM |
| `L2-168-001.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 `L2-168-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._