# 📐  L2 Spec — Three-Photon Microscopy (chi-5 deep-tissue imaging) Mismatch-Only Spec

**ID:** `L2-023-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-023`](/artifact/l1/L1-023)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554171

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 2048 |
| W | px | 128 – 2048 |
| Z | — | 16 – 512 |
| Na | — | 0.5 – 1.1 |
| Pixel nm | nm | 200 – 1000 |
| Lambda ex nm | nm | 1200 – 1700 |
| Peak photons | photons | 5 – 500 |
| Pulse width fs | — | 30 – 300 |
| Sample scattering | — | 0.0 – 0.8 |
| Long wavelength absorption | — | 0.0 – 0.5 |

## 2. Tolerance (ε)

**Type:** `fn`

```
15.0 + 2.5 * log10(peak_photons / 5) - 6.0 * sample_scattering - 4.0 * long_wavelength_absorption
```

## 3. Difficulty

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

## 4. Fingerprint

`e39d99e7517186871f8f6d3cbd7462635a5a63d6a534d07a094b48da29e80cb6`

## 5. On-chain Registration

- **Chain hash:** `0x9752a768f0af846aa5521906eeb734a5f2c9e3e134db2202176353c20cbf5f65`
- **Chain tx hash:** `0xb336be9cfae50de121e90702c43a6282146cbe2c7dd7d82f1a90e6788f0f0b60`
- **Chain block:** `41554171`

---

## File Mapping

This bundle consists of: `L2-023-001.md`, `L2-023-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-023-001.md` | Source of truth — edit this | Human or LLM |
| `L2-023-001.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 `L2-023-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._