# 📐 L2 Spec — Very Long Baseline Interferometry (VLBI) Mismatch-Only Spec
**ID:** `L2-106-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-106`](/artifact/l1/L1-106)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554201
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| Rfi | — | 0.0 – 0.5 |
| N time | — | 60 – 3600 |
| Snr db | dB | 0.0 – 30.0 |
| Lambda cm | — | 0.01 – 500 |
| N antennas | — | 4 – 100 |
| N baselines | — | 6 – 4950 |
| Ionospheric delay | — | 0.0 – 1.0 |
| Atomic clock drift | — | 0.0 – 0.01 |
| Uv coverage fraction | — | 0.005 – 0.5 |
| Station position error | — | 0.0 – 10.0 |
## 2. Tolerance (ε)
**Type:** `fn`
```
10.0 + 0.3 * SNR_dB + 5.0 * log10(N_antennas / 4) - 4.0 * ionospheric_delay - 3.0 * RFI
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |
## 4. Fingerprint
`c3d010990d00e9ebbe4406e4fb5a127979e78b06fc30148802f707757dfef284`
## 5. On-chain Registration
- **Chain hash:** `0x90929a04eee0455c1cd3105538f13ed9ccce54539b166e3290b9b6a368ae2821`
- **Chain tx hash:** `0xcfc66cbe7d1a5d5764d940361e11c8f6308c91c58f197ba33bbe536327ab2d8b`
- **Chain block:** `41554201`
---
## File Mapping
This bundle consists of: `L2-106-001.md`, `L2-106-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-106-001.md` | Source of truth — edit this | Human or LLM |
| `L2-106-001.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 `L2-106-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._