# 📐 L2 Spec — SIMS Imaging Surface-Mapping Spec
**ID:** `L2-143-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-143`](/artifact/l1/L1-143)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.55 · **Delta tier:** 5
> **⛓ On-chain block:** 41554231
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 2048 |
| K | — | 1 – 30 |
| W | px | 32 – 2048 |
| N mz | — | 1000 – 100000 |
| R mass | — | 1000 – 100000 |
| Beam drift | — | 0.0 – 0.1 |
| I primary na | — | 0.001 – 10 |
| Dead time saturation | — | 0.0 – 0.3 |
| Mass calibration error | — | 0.0 – 100 |
| Matrix ionization yield | — | 0.0 – 2.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.02 + 0.05 * matrix_ionization_yield + 0.1 * beam_drift + 0.1 * dead_time_saturation + 1e-4 * mass_calibration_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.55 |
| Delta tier | 5 |
## 4. Fingerprint
`1bb47136dd9ea0926d09d26ca5d311f28ebe386fdd8275a573acfa00b42848f3`
## 5. On-chain Registration
- **Chain hash:** `0x1c4931598ee4666c003f182533d0b9a27246bca3c16c278446cb9bad77ca1263`
- **Chain tx hash:** `0x9c01920ee3cfdce80e74dae1261aecbbc6b7963c0a80660caf79a76cc5d229b7`
- **Chain block:** `41554231`
---
## File Mapping
This bundle consists of: `L2-143-001.md`, `L2-143-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-143-001.md` | Source of truth — edit this | Human or LLM |
| `L2-143-001.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 `L2-143-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._