diff --git a/docs/re/structures/ui-resting-pose.md b/docs/re/structures/ui-resting-pose.md
index bb6da9d1..8e22e4f5 100644
--- a/docs/re/structures/ui-resting-pose.md
+++ b/docs/re/structures/ui-resting-pose.md
@@ -70,6 +70,46 @@ and there are two independent reasons:
   produce a sharp minimum instead. The sweep was run for a noise scale and answers
   this too.
 
+### ✅ The CAPTURE axis has a noise floor too, and it is 0 in the region measured
+
+`sylpheed-port` found their `main_menu` row drifting 13.25–13.30 across runs — a
+focus ring spinning on a free-running clock — and made the general point that **a
+margin only means something against the noise it sits on**. The `--at` plateau
+above measures the *render* axis. It says nothing about how much the score moves
+between two **captures** of the same screen, which is a second noise source and
+the one my single JP grab is exposed to.
+
+Measured, from two independent captures of the settled EN title taken at
+different phases of its free-running plate pulse, scored against one render:
+
+| | whole frame | inside the measurement box |
+|---|---|---|
+| plate-pulse **peak** | 31.302 | 21.230 |
+| plate-pulse **trough** | 28.463 | 21.230 |
+| **spread** | **2.839** | **0.000** |
+
+⚠️ A 0.000 is the result this corpus distrusts most, so it carries its control:
+the two captures differ by **83 496 pixels** whole-frame (max |d| 174) — they are
+genuinely different grabs — and by **0** inside the box. The screen's free-running
+element is the plate, which lies outside the logo region the adjudication uses.
+
+**So the margins re-stated against every noise floor now measured:**
+
+| comparison | margin | vs render noise (1.2) | vs capture noise (0.0 in-box, 2.8 whole-frame) |
+|---|---|---|---|
+| stale vs fixed era | **16.7** | 14× | ≥5.9× | 
+| settle vs rest | **1.5** | 1.2× | below whole-frame noise |
+
+The era result survives on both axes. The settle-vs-rest negative is **stronger**
+than first stated: 1.5 is not merely inside the render plateau's flatness, it is
+below the whole-frame capture spread as well.
+
+⚠️ **Reach of the transfer.** This is the *EN* title's capture noise applied to the
+*JP* title's box. Build 7 carries `ptloop01/02.rat`, which may animate inside that
+region where the EN plate does not — so the in-box 0.000 is a measurement on a
+neighbouring screen, not on the one adjudicated. A second JP capture would settle
+it and has not been taken.
+
 ⚠️ **Reach.** One screen, one capture. The absolute residual is ~40 RMSE even at
 the best instant, because the JP title carries live animation a static render
 cannot reproduce; every comparison here is relative and none of it says our render