# 📐 L2 Spec — Fourier Ptychographic Microscopy (FPM) Mismatch-Only Spec
**ID:** `L2-008-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-008`](/artifact/l1/L1-008)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554157
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 256 – 4096 |
| W | px | 256 – 4096 |
| N led | — | 49 – 625 |
| Na obj | — | 0.05 – 0.3 |
| Overlap | — | 0.35 – 0.85 |
| Peak photons | photons | 50 – 10000 |
| Partial coherence | — | 0.7 – 1.0 |
| Led position error | — | 0.0 – 2.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
20.0 + 2.0 * log2(N_LED / 49) + 2.0 * log10(peak_photons / 50) - 10.0 * LED_position_error / 2.0
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`56294b02df4abe05bd90bc7fd6bdbf5c060077901488230a0b6aeb556f47127f`
## 5. On-chain Registration
- **Chain hash:** `0x24cdd02f4649c85726eabe33b69b77ffbfad70e731df1ccb0407b379493478a5`
- **Chain tx hash:** `0x5b96813584b69eacf18dd84d8ef6c27cc2912d451468b99fcdd1a77caba23e0a`
- **Chain block:** `41554157`
---
## File Mapping
This bundle consists of: `L2-008-001.md`, `L2-008-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-008-001.md` | Source of truth — edit this | Human or LLM |
| `L2-008-001.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 `L2-008-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._