# 📐 L2 Spec — Tidal Analysis — harmonic tidal constituent extraction Mismatch-Only Spec
**ID:** `L2-292-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-292`](/artifact/l1/L1-292)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554069
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Snr db | dB | 10 – 60 |
| N samples | — | 720 – 525600 |
| Nodal error | — | 0.0 – 0.05 |
| N constituents | — | 5 – 200 |
| Residual surge | — | 0.0 – 0.3 |
| Shallow water error | — | 0.0 – 0.2 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 0.3*SNR_dB - 50.0*nodal_error - 15.0*shallow_water_error - 10.0*residual_surge
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`d853f8dd13dfc6e07c5e295b1cc2951b03e4b34a47e516764cdb443c1b5ad552`
## 5. On-chain Registration
- **Chain hash:** `0xccc774d371978e235aa47618d0a9accffb4b74845a44b991994280a669523573`
- **Chain tx hash:** `0x3cb615ad23fdfb57d9d66ab39c9a3bfe3831c0485e5e9fbb941746cf45c6ba62`
- **Chain block:** `41554069`
---
## File Mapping
This bundle consists of: `L2-292-001.md`, `L2-292-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-292-001.md` | Source of truth — edit this | Human or LLM |
| `L2-292-001.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 `L2-292-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._