# 📐 L2 Spec — Terahertz Imaging (0.1-10 THz time-domain / CW) Mismatch-Only Spec
**ID:** `L2-116-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-116`](/artifact/l1/L1-116)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554203
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 64 – 1024 |
| W | px | 64 – 1024 |
| N freq | — | 64 – 2048 |
| Snr db | dB | 5.0 – 40.0 |
| Dispersive media | — | 0.0 – 0.5 |
| Water absorption | — | 0.0 – 0.5 |
| Power fluctuation | — | 0.0 – 0.2 |
| Scattering at defects | — | 0.0 – 0.3 |
## 2. Tolerance (ε)
**Type:** `fn`
```
14.0 + 0.3 * SNR_dB - 10.0 * water_absorption - 8.0 * scattering_at_defects
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`894938e510f41067823ca25fb2af142c2df1ced28ec08e34464d3a90fcfe559c`
## 5. On-chain Registration
- **Chain hash:** `0x51b71a9bd957034d4f5e449396b89a372fd6b86419f43d6ba26289779a608c6c`
- **Chain tx hash:** `0xaf921685ce72d83d8c83bde59fc27d8c18230fe293882a90f27644a7041ba89a`
- **Chain block:** `41554203`
---
## File Mapping
This bundle consists of: `L2-116-001.md`, `L2-116-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-116-001.md` | Source of truth — edit this | Human or LLM |
| `L2-116-001.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 `L2-116-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._