# 📐  L2 Spec — SAXS BioSAXS Indirect-FT Spec

**ID:** `L2-126-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-126`](/artifact/l1/L1-126)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.5 · **Delta tier:** 5
> **⛓ On-chain block:** 41554216

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| N q | — | 50 – 2000 |
| Rg nm | nm | 0.5 – 50 |
| Q max | — | 0.1 – 1.0 |
| Q min | — | 0.001 – 0.1 |
| Beam damage | — | 0.0 – 0.5 |
| Polydispersity | — | 0.0 – 0.5 |
| Buffer mismatch | — | 0.0 – 0.3 |
| Q range truncation | — | 0.0 – 0.5 |
| Concentration mg ml | — | 0.1 – 20 |
| Aggregation fraction | — | 0.0 – 0.5 |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.02 + 0.3 * aggregation_fraction + 0.2 * polydispersity + 0.1 * buffer_mismatch + 0.1 * beam_damage
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.5 |
| Delta tier | 5 |

## 4. Fingerprint

`8f128a7dc9bad5b203f22b87cb05a6f9c478aa6064a2497ea3920890e8c73a13`

## 5. On-chain Registration

- **Chain hash:** `0x8c8952fbd06bf2cf3a434039ff7b9c0d0705df0c22eb66afac58ebaeea08178c`
- **Chain tx hash:** `0x912d4a1938d142d6cb3f922abd8db7d723db5924f00037c5119fa1ce43b700b2`
- **Chain block:** `41554216`

---

## File Mapping

This bundle consists of: `L2-126-001.md`, `L2-126-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-126-001.md` | Source of truth — edit this | Human or LLM |
| `L2-126-001.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 `L2-126-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._