# 📐 L2 Spec — Seismic Reflection — post-stack migration and imaging Mismatch-Only Spec
**ID:** `L2-276-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-276`](/artifact/l1/L1-276)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.48 · **Delta tier:** 5
> **⛓ On-chain block:** 41554054
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 128 – 8192 |
| W | px | 128 – 8192 |
| Z | — | 64 – 4096 |
| Snr db | dB | 0 – 40 |
| N shots | — | 16 – 100000 |
| N receivers | — | 64 – 100000 |
| Source pos error | — | 0.0 – 0.05 |
| Topography error | — | 0.0 – 0.1 |
| Velocity model error | — | 0.0 – 0.2 |
| Dipole sensitivity error | — | 0.0 – 0.2 |
## 2. Tolerance (ε)
**Type:** `fn`
```
16.0 + 0.25*SNR_dB - 20.0*velocity_model_error - 10.0*source_pos_error - 12.0*topography_error
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.48 |
| Delta tier | 5 |
## 4. Fingerprint
`bffcc54dff348e4580d5e1531e517afea9b13c5eccdc2c2ff1c857fb571cecfe`
## 5. On-chain Registration
- **Chain hash:** `0x0d2640c5846d2324d235d43dc95863d7f3ce6b2335ffefb83890a95f4953e546`
- **Chain tx hash:** `0xfe791d3c5ecd3de460c2116df69dcfba70f805506915bb4e0a2fd25dfd94d85a`
- **Chain block:** `41554054`
---
## File Mapping
This bundle consists of: `L2-276-001.md`, `L2-276-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-276-001.md` | Source of truth — edit this | Human or LLM |
| `L2-276-001.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 `L2-276-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._