# 📐 L2 Spec — MR Spectroscopy Tumor Grading (PWDR) — Spec Skeleton
**ID:** `L2-516-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-516`](/artifact/l1/L1-516)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41553376
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Te ms | ms | 20 – 144 |
| Tr ms | ms | [NEEDS_HAND_AUTHORING: bounds] |
| Snr db | dB | [NEEDS_HAND_AUTHORING: bounds] |
| H voxels | — | 4 – 64 |
| W voxels | — | 4 – 64 |
| Z voxels | — | 1 – 32 |
| B0 field t | — | 1.5 – 7.0 |
| Voxel size mm | mm | 3 – 20 |
| Spectral points | — | 256 – 4096 |
| B0 inhomogeneity | — | [NEEDS_HAND_AUTHORING: bounds] |
| Partial volume csf | — | [NEEDS_HAND_AUTHORING: bounds] |
| Voxel lipid contamination | — | [NEEDS_HAND_AUTHORING: bounds] |
| Water suppression residual | — | [NEEDS_HAND_AUTHORING: bounds] |
| Threshold calibration age effect | — | [NEEDS_HAND_AUTHORING: bounds] |
## 2. Tolerance (ε)
**Type:** `fn`
```
0.80_accuracy
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`48df1d6da9f816af52fe7d2aa41985b038ac9c8caa449fe9b9d72166e6b66c3c`
## 5. On-chain Registration
- **Chain hash:** `0xbcfed9df9f3cfb56f92f992bb37dab6fc2751e33c929cdc459650269b0e5860b`
- **Chain tx hash:** `0xc3ed5d20d832a6cf7e671ae3018635c54aeda408d61aeff44c8a22418a7658dc`
- **Chain block:** `41553376`
---
## File Mapping
This bundle consists of: `L2-516-001.md`, `L2-516-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-516-001.md` | Source of truth — edit this | Human or LLM |
| `L2-516-001.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 `L2-516-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._