# 📐 L2 Spec — 4D-STEM — pixelated-detector scanning diffraction imaging Mismatch-Only Spec
**ID:** `L2-088-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-088`](/artifact/l1/L1-088)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554187
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 1024 |
| W | px | 32 – 1024 |
| Kv | — | 60 – 300 |
| N q | — | 32 – 1024 |
| Pixel a | — | 0.1 – 2.0 |
| Dose e per a2 | — | 100 – 100000 |
| Scan distortion | — | 0.0 – 0.05 |
| Probe aberration | — | 0.0 – 0.3 |
| Partial coherence | — | 0.6 – 1.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
17.0 + 2.0 * log10(dose_e_per_A2 / 100) - 15.0 * probe_aberration - 25.0 * scan_distortion
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`8384a83794a2f36d995bfff9bc70639eb3ee82596157b8720ba0510ae0ea9efe`
## 5. On-chain Registration
- **Chain hash:** `0x4b4ebf7930eef58980842c74e5b5edb3a9cf82393f44eea81bd0c36c327f357c`
- **Chain tx hash:** `0x0ab2c99d7d04c7a193909492346366fe25786f265643d6c3fc1026eb6b291fab`
- **Chain block:** `41554187`
---
## File Mapping
This bundle consists of: `L2-088-001.md`, `L2-088-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-088-001.md` | Source of truth — edit this | Human or LLM |
| `L2-088-001.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 `L2-088-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._