# 📐 L2 Spec — Zernike Phase-Contrast Microscopy Mismatch-Only Spec
**ID:** `L2-017-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-017`](/artifact/l1/L1-017)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.45 · **Delta tier:** 5
> **⛓ On-chain block:** 41554159
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 256 – 4096 |
| W | px | 256 – 4096 |
| Na | — | 0.3 – 1.0 |
| Pixel nm | nm | 100 – 500 |
| Lambda nm | nm | 400 – 700 |
| Photon count | — | 100 – 20000 |
| Halo artifact | — | 0.0 – 0.5 |
| Phase plate alignment | — | 0.0 – 0.1 |
| Annulus diaphragm drift | — | 0.0 – 0.1 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 1.5 * log10(photon_count / 100) - 5.0 * phase_plate_alignment - 6.0 * halo_artifact
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.45 |
| Delta tier | 5 |
## 4. Fingerprint
`182912256e3dbad71e77dcd109bf5fa50db5ecb3c1f7d2f5380861321c202d3f`
## 5. On-chain Registration
- **Chain hash:** `0xa77a0c16ce91bdbba509b20b2c1c1e7c39855f2895e1ec949cbc5af8fe2afb40`
- **Chain tx hash:** `0x93994de13324587aba93dfda88c54e4a3609092c02ad6565f6a58340c1f2f680`
- **Chain block:** `41554159`
---
## File Mapping
This bundle consists of: `L2-017-001.md`, `L2-017-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-017-001.md` | Source of truth — edit this | Human or LLM |
| `L2-017-001.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 `L2-017-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._