# 📐  L2 Spec — pCT Reconstruction Spec

**ID:** `L2-131-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-131`](/artifact/l1/L1-131)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.55 · **Delta tier:** 5
> **⛓ On-chain block:** 41554217

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N view | — | 10 – 720 |
| Pixel mm | mm | 0.2 – 5 |
| E beam mev | — | 70 – 330 |
| Motion blur | — | 0.0 – 5 |
| Dose limited snr | — | 0.5 – 100 |
| N proton per view | — | 100000.0 – 10000000000.0 |
| Mls path model error | — | 0.0 – 0.3 |
| Calorimeter calibration | — | 0.0 – 0.05 |
| Nuclear interaction fraction | — | 0.0 – 0.2 |

## 2. Tolerance (ε)

**Type:** `fn`

```
5e-4 + 0.005 * mls_path_model_error + 0.01 * nuclear_interaction_fraction + 0.01 * calorimeter_calibration + 0.02 / dose_limited_snr
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.55 |
| Delta tier | 5 |

## 4. Fingerprint

`ed455ca4f4c6321b5b214f9f2e83996329b6a7a80e32bcf1850e4e55fb8607b7`

## 5. On-chain Registration

- **Chain hash:** `0xad7da0179acace00f3b9bc0e64a30c40f382499d5bd747a4014603112400049a`
- **Chain tx hash:** `0x362dfee7be0452f677eb8b82be5907a9710169e0e973df8e10e9a8b795669388`
- **Chain block:** `41554217`

---

## File Mapping

This bundle consists of: `L2-131-001.md`, `L2-131-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-131-001.md` | Source of truth — edit this | Human or LLM |
| `L2-131-001.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 `L2-131-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._