# 📐 L2 Spec — ODT Rytov-Regime Mismatch-Only Spec
**ID:** `L2-073-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-073`](/artifact/l1/L1-073)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.62 · **Delta tier:** 5
> **⛓ On-chain block:** 41554173
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| D | — | 32 – 512 |
| H | px | 128 – 2048 |
| W | px | 128 – 2048 |
| N 0 | — | 1.0 – 1.5 |
| K angles | — | 30 – 360 |
| Na illum | — | 0.4 – 1.4 |
| Delta n max | — | 0.001 – 0.1 |
| Wavelength nm | nm | 400 – 800 |
| Aberration zernike | — | 0.0 – 0.5 |
| Limited angle range | — | 90 – 360 |
| Illumination angle error | — | 0.0 – 2.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 3.0 * log2(K_angles / 30) + 3.0 * (NA_illum - 0.4) - 8.0 * illumination_angle_error / 2.0
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.62 |
| Delta tier | 5 |
## 4. Fingerprint
`445c47e397eef669e5457e9b4fdde443646e25a1029b027f4c4e66166ec338a8`
## 5. On-chain Registration
- **Chain hash:** `0xc51db4f548090008133cf711b589da997f7040dfdf626c57a7d999ca41a0cea3`
- **Chain tx hash:** `0xa5e950ddeb2b47f23e28ce4705f48603c9f17c00c4fc4b1e315f7f992151c55e`
- **Chain block:** `41554173`
---
## File Mapping
This bundle consists of: `L2-073-001.md`, `L2-073-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-073-001.md` | Source of truth — edit this | Human or LLM |
| `L2-073-001.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 `L2-073-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._