# C1261 — Explain the950 plus-or-minus300 presentation

## Question

What additional source content does the sum-and-difference display contribute?

## Inputs

```json
{}
```

## Sources

```json
[
  "C1254",
  "C1260",
  "Strategy §4.2"
]
```

## Opened utc

2026-09-28T05:46:47.657744+00:00

## Results

```json
{
  "sum_difference": {
    "path": "model/regular_kernel_sum_difference_scope.json",
    "sha256": "54fafdd8b71ac0f1f88ddad4d8c43dd2683e1a7f29634dd9fef272077fe4f235",
    "bytes": 394
  },
  "midpoint": 950,
  "halfwidth": 300
}
```

## Finding

The sameheadpair is950±300, with midpoint19u/2 andhalfwidth3u. Its equality toNoah’s950-year life is a source-role comparison; rewriting thepair thisway does not explain or replace thelocatedcenturychanges.

## Reassessment

Integrate thecurrentSP countingmechanism into thekernel comparisonwithoutforcing itintotheLXX formula.

## Checks

```json
{
  "mid950": true,
  "half300": true,
  "reconstruct": true
}
```

## Closed utc

2026-09-28T05:46:47.658839+00:00

## Record provenance

Exact record hash: `3da77f0a9678c956cf650c363eac249f929005fe3e628e4235e6ccb9712da828`

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