# 📐 L2 Spec — Electron Tomography — tilt-series 3D reconstruction Mismatch-Only Spec
**ID:** `L2-086-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-086`](/artifact/l1/L1-086)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554187
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 512 – 4096 |
| W | px | 512 – 4096 |
| Z | — | 32 – 512 |
| Kv | — | 200 – 300 |
| N tilts | — | 20 – 200 |
| Beam damage | — | 0.0 – 0.5 |
| Missing wedge | — | 0.1 – 0.6 |
| Peak electrons | — | 1 – 500 |
| Tilt range deg | deg | 40 – 80 |
| Alignment error | — | 0.0 – 5.0 |
| Tilt angle error | — | 0.0 – 0.5 |
## 2. Tolerance (ε)
**Type:** `fn`
```
16.0 + 3.0 * log2(N_tilts / 20) - 12.0 * missing_wedge - 0.3 * alignment_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`dd56e87d77bf278695f6d9b2eb5e0e32f49ebabf1027d051472eccb313ce2366`
## 5. On-chain Registration
- **Chain hash:** `0xb181c68d1ab9be607da255dfae284b808ea103803ed7862a093e0653009c11c0`
- **Chain tx hash:** `0x69975854cfe349af94a39a79a7ee15ee468575f4257d92e9b5be42b8f53561a3`
- **Chain block:** `41554187`
---
## File Mapping
This bundle consists of: `L2-086-001.md`, `L2-086-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-086-001.md` | Source of truth — edit this | Human or LLM |
| `L2-086-001.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 `L2-086-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._