# 📐 L2 Spec — Holographic Reconstruction — wavefront from interference Mismatch-Only Spec
**ID:** `L2-246-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-246`](/artifact/l1/L1-246)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41553993
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 4096 |
| W | px | 128 – 4096 |
| Z m | m | 0.001 – 10 |
| Snr db | dB | 0 – 40 |
| Lambda nm | nm | 100 – 10000 |
| Z focus error | — | 0.0 – 0.05 |
| Twin image error | — | 0.0 – 0.3 |
| Ref beam tilt error | — | 0.0 – 0.1 |
## 2. Tolerance (ε)
**Type:** `fn`
```
20.0 + 0.3*SNR_dB - 20.0*ref_beam_tilt_error - 25.0*z_focus_error - 10.0*twin_image_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`808049f6481eb835b71ce28066d14323afbf1d0c12ff7ce5a4c30dbc777ae8c6`
## 5. On-chain Registration
- **Chain hash:** `0x95204f162a6cf0025c8d06f46ab3aae2fb6d87d74129ad9a87d1285dd3e825a1`
- **Chain tx hash:** `0x76afec9b10fa121379779650261eb13b8603114f2d76d8fb03801e1af7d46ab6`
- **Chain block:** `41553993`
---
## File Mapping
This bundle consists of: `L2-246-001.md`, `L2-246-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-246-001.md` | Source of truth — edit this | Human or LLM |
| `L2-246-001.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 `L2-246-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._