# C1316 — Record the SP cap-to-rectangle reconstruction

## Question

How do source rows supply the two rectangle radii?

## Inputs

```json
{}
```

## Sources

```json
[
  "C1223–C1230",
  "C1314"
]
```

## Opened utc

2026-09-28T06:19:24.601864+00:00

## Results

```json
{
  "reconstruction": {
    "path": "model/reconstruction_SP_rectangle.json",
    "sha256": "dd41f7bc5f8672c7eba7c95dfba5fedc79d2b64af31a7c043988f7c3b11d059c",
    "bytes": 1557
  }
}
```

## Finding

The rectangle now has a continuous source-to-result explanation: located SP losses supply its cumulative radius while located age changes supply its Regular radius; the source wrappers close the equal-gain relation.

## Reassessment

Write the Rounded Moses reconstruction entry.

## Checks

```json
{
  "contract": true,
  "loss_sum": true,
  "evidence": true
}
```

## Closed utc

2026-09-28T06:19:24.602643+00:00

## Record provenance

Exact record hash: `9165997117872d563ec62702a4b8a52be67331a002a2d3065a83dd5598f51959`

Source journal: `Research_Cycles/C1132_C1431_Recovered/journal.json`