# 📐 L2 Spec — Lattice Light Sheet Microscopy (LLSM) — Bessel-lattice 3D imaging Mismatch-Only Spec
**ID:** `L2-020-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-020`](/artifact/l1/L1-020)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554171
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 512 – 4096 |
| W | px | 256 – 2048 |
| Z | — | 32 – 512 |
| Na det | — | 0.8 – 1.2 |
| Na illum | — | 0.3 – 0.8 |
| Peak photons | photons | 30 – 2000 |
| Lattice pitch nm | nm | 600 – 3000 |
| Lattice registration | — | 0.0 – 0.1 |
| Dithering phase error | — | 0.0 – 0.2 |
| Sample induced aberration | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 2.0 * log10(peak_photons / 30) - 15.0 * lattice_registration - 10.0 * sample_induced_aberration
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`95bc1aefb018434a6b7035faad7efd12ec729283b19e1aaa4fb043ff4dedbf2d`
## 5. On-chain Registration
- **Chain hash:** `0xd883333cfff44376484d2ca60e4da000fc49c204f73846e1e381b0e70a16c53a`
- **Chain tx hash:** `0xa160ad6491e533b9f5127e4259c77fd142ee75d6c27245e67fc900f7bb473e38`
- **Chain block:** `41554171`
---
## File Mapping
This bundle consists of: `L2-020-001.md`, `L2-020-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-020-001.md` | Source of truth — edit this | Human or LLM |
| `L2-020-001.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 `L2-020-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._