# 📐 L2 Spec — Convection-Diffusion-Reaction — transport with source terms Mismatch-Only Spec
**ID:** `L2-191-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-191`](/artifact/l1/L1-191)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41553979
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 32 – 2048 |
| W | px | 32 – 2048 |
| Snr db | dB | 0 – 40 |
| D error | — | 0.0 – 0.2 |
| N times | — | 50 – 100000 |
| Velocity error | — | 0.0 – 0.1 |
| Rate const error | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
18.0 + 0.3*SNR_dB - 10.0*rate_const_error - 15.0*D_error - 30.0*velocity_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`1e48a1805159ff7ad4b42a0c9b98d9ce15d5b195033a2a0b88d8a87311827197`
## 5. On-chain Registration
- **Chain hash:** `0x9b5ab32d766ada8a1b14a22e244822b3f96b1c12b108ccf98daa126a11940346`
- **Chain tx hash:** `0xfc9462a6563c21f6866abcb6a1f7c18dec1ea9b3c12c34aac45a8f07ef7e01f9`
- **Chain block:** `41553979`
---
## File Mapping
This bundle consists of: `L2-191-001.md`, `L2-191-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-191-001.md` | Source of truth — edit this | Human or LLM |
| `L2-191-001.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 `L2-191-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._