# 📐 L2 Spec — Transmission Electron Microscopy (TEM) — thin-section contrast imaging Mismatch-Only Spec
**ID:** `L2-085-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-085`](/artifact/l1/L1-085)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554187
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 1024 – 8192 |
| W | px | 1024 – 8192 |
| Kv | — | 80 – 300 |
| Cs mm | mm | 0.01 – 5.0 |
| Pixel a | — | 0.3 – 5.0 |
| Drift nm | nm | 0.0 – 5.0 |
| Defocus nm | nm | -2000 – 2000 |
| Peak electrons | — | 1 – 1000 |
| Envelope coherence | — | 0.5 – 1.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
18.0 + 2.0 * log10(peak_electrons / 1) - 0.5 * drift_nm + 8.0 * envelope_coherence
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`d33d026668ca2402fe0a811bba4227cd4e40025a312b40efe287ef3c50dde98c`
## 5. On-chain Registration
- **Chain hash:** `0x5c421e3737004f5b173dbc4619909c2fc4c0861cbc1c423db232fb81dad8f750`
- **Chain tx hash:** `0x0c5063271202a4d62e69f13d2c052a850d363768f6b681f7c396e2eb54f3c5fb`
- **Chain block:** `41554187`
---
## File Mapping
This bundle consists of: `L2-085-001.md`, `L2-085-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-085-001.md` | Source of truth — edit this | Human or LLM |
| `L2-085-001.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 `L2-085-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._