# 📐  L2 Spec — Stellar Coronagraphy PSF Subtraction — Nominal + Mismatch Specs

**ID:** `L2-166-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-166`](/artifact/l1/L1-166)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.35 · **Delta tier:** 5
> **⛓ On-chain block:** 41554247

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 2048 |
| W | px | 128 – 2048 |
| N frames | — | 10 – 200 |
| Contrast ratio | — | 1e-08 – 0.0001 |
| Speckle lifetime s | s | 10 – 300 |

## 2. Tolerance (ε)

**Type:** `fn`

```
-4.0 - 1.0 * log10(N_frames / 30)
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.35 |
| Delta tier | 5 |

## 4. Fingerprint

`d1f5be81d71a60a879df4f57dac7064c691af76cf5c7400fc37088fcc7257723`

## 5. On-chain Registration

- **Chain hash:** `0xa59a09e8dc2a01a08e7e400f06d1033bae3e53a5c8dba65d3c153cf7891b4b54`
- **Chain tx hash:** `0x99660be31fdacb14adff282b7f9b9acf728e569fad7b2800785ab6f38b63892e`
- **Chain block:** `41554247`

---

## File Mapping

This bundle consists of: `L2-166-001.md`, `L2-166-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-166-001.md` | Source of truth — edit this | Human or LLM |
| `L2-166-001.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 `L2-166-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._