# 📐 L2 Spec — Light Sheet Fluorescence Microscopy (LSFM / SPIM) Mismatch-Only Spec
**ID:** `L2-006-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-006`](/artifact/l1/L1-006)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554157
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 512 – 4096 |
| W | px | 512 – 4096 |
| Z | — | 32 – 1024 |
| Na det | — | 0.8 – 1.2 |
| Sheet nm | nm | 500 – 5000 |
| Z step nm | nm | 200 – 2000 |
| Sheet tilt | — | 0.0 – 0.05 |
| Peak photons | photons | 50 – 5000 |
| Sample induced aberration | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 2.0 * log10(peak_photons / 50) - 10.0 * sheet_tilt - 12.0 * sample_induced_aberration
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`7a419316eff7ae55188457ab30dfe60e103f6ff9e82e1e792da8681da5e6c0bc`
## 5. On-chain Registration
- **Chain hash:** `0x48e8d33e3a86cce491061e0b70f93c18bb894c69f09fc17f48a9a71358dd47f4`
- **Chain tx hash:** `0x9b3dab0839af7c7f4ee079f4cd0568fda2101ab767f7c83c9f1513cbe901fcd6`
- **Chain block:** `41554157`
---
## File Mapping
This bundle consists of: `L2-006-001.md`, `L2-006-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-006-001.md` | Source of truth — edit this | Human or LLM |
| `L2-006-001.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 `L2-006-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._