# 📐 L2 Spec — STEM-EDX — X-ray energy-dispersive elemental mapping Mismatch-Only Spec
**ID:** `L2-094-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-094`](/artifact/l1/L1-094)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554188
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 2048 |
| W | px | 128 – 2048 |
| Kv | — | 60 – 300 |
| Dwell ms | ms | 0.1 – 1000 |
| N elements | — | 2 – 30 |
| Peak overlap | — | 0.0 – 0.5 |
| Peak electrons | — | 50 – 100000 |
| Detector dead time | — | 0.0 – 0.5 |
| Absorption correction | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
18.0 + 2.5 * log10(peak_electrons / 50) - 8.0 * peak_overlap - 5.0 * detector_dead_time
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`4a97a756b9834f72046ab9b926b144032305232959cb2996bdb2f7763298fec2`
## 5. On-chain Registration
- **Chain hash:** `0x54511ae1ddf46bbccb4554b840bb87ba5cc340dfb76003ef1768f99d021b25bc`
- **Chain tx hash:** `0x038649ff221354fa9a7c601854466470d2e3bb67a99cfaaa87696c9943031476`
- **Chain block:** `41554188`
---
## File Mapping
This bundle consists of: `L2-094-001.md`, `L2-094-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-094-001.md` | Source of truth — edit this | Human or LLM |
| `L2-094-001.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 `L2-094-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._