# 📐  L2 Spec — Hodgkin-Huxley Neuron Model Parameter Estimation — Nominal + Mismatch Specs

**ID:** `L2-396-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-396`](/artifact/l1/L1-396)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.38 · **Delta tier:** 5
> **⛓ On-chain block:** 41555202

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| G na ratio | — | 50 – 500 |
| I ext ua cm2 | — | 0 – 50 |
| Temperature c | — | 0 – 37 |
| N voltage samples | — | 1000 – 100000 |

## 2. Tolerance (ε)

**Type:** `fn`

```
1.0 + 1.0 * (10 / N_voltage_samples * 1000) ** 0.3
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.38 |
| Delta tier | 5 |

## 4. Fingerprint

`306bf4a722f51fded5409656b8bb5bb0dffe59fd5447bd4e8546630889f2beec`

## 5. On-chain Registration

- **Chain hash:** `0x635aef5c857c49e05ffe58d6f41a3244973db9156fd15e1b652d834ec0044169`
- **Chain tx hash:** `0x251f36359ef0793c29c3ca598b463b6f5b8b4ca5a9aca768fcb650cc9ed853fd`
- **Chain block:** `41555202`

---

## File Mapping

This bundle consists of: `L2-396-001.md`, `L2-396-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-396-001.md` | Source of truth — edit this | Human or LLM |
| `L2-396-001.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 `L2-396-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._