diff --git a/ui.go b/ui.go
index edae1e2..0ce2b2b 100644
--- a/ui.go
+++ b/ui.go
@@ -30,17 +30,18 @@ func scalePanelCount(v uint64) string {
 }
 
 var (
-	uiBg     = rgb{0x0d, 0x0d, 0x0d}
-	uiInk    = rgb{0xf2, 0xf2, 0xf0}
-	uiInk2   = rgb{0xc3, 0xc2, 0xb7}
-	uiMuted  = rgb{0x89, 0x87, 0x81}
-	uiHair   = rgb{0x28, 0x28, 0x26}
-	uiGood   = rgb{0x0c, 0xa3, 0x0c}
-	uiWarn   = rgb{0xfa, 0xb2, 0x19}
-	uiCrit   = rgb{0xd0, 0x3b, 0x3b}
-	uiCellOK = rgb{0x0a, 0x5d, 0x0a}
-	uiCellNA = rgb{0x3a, 0x3a, 0x37}
-	uiAccent = rgb{0x39, 0x87, 0xe5}
+	uiBg       = rgb{0x0d, 0x0d, 0x0d}
+	uiInk      = rgb{0xf2, 0xf2, 0xf0}
+	uiInk2     = rgb{0xc3, 0xc2, 0xb7}
+	uiMuted    = rgb{0x89, 0x87, 0x81}
+	uiHair     = rgb{0x28, 0x28, 0x26}
+	uiGood     = rgb{0x0c, 0xa3, 0x0c}
+	uiWarn     = rgb{0xfa, 0xb2, 0x19}
+	uiCrit     = rgb{0xd0, 0x3b, 0x3b}
+	uiCellOK   = rgb{0x0a, 0x5d, 0x0a}
+	uiCellNA   = rgb{0x3a, 0x3a, 0x37}
+	uiCellMeas = rgb{0x20, 0x4d, 0x83}
+	uiAccent   = rgb{0x39, 0x87, 0xe5}
 )
 
 func classColor(c int) rgb {
@@ -432,12 +433,16 @@ func (d *display) drawColHeaders() {
 	d.hairline(d.rowYs[0] - 1)
 }
 
-// One row of history cells: na for a slot with nothing believable (never
-// sampled, or spent inside a measure), otherwise judged by the row.
+// One row of history cells: na for a slot never sampled, the non-committal
+// measure color for one spent inside a cable measure, otherwise judged by the
+// row.
 func (d *display) heatRow(rowY int, hv histView, judge func(histSlot) rgb) {
 	for k, s := range hv.slots {
 		c := uiCellNA
-		if s.sampled && !s.measuring {
+		switch {
+		case s.measuring:
+			c = uiCellMeas
+		case s.sampled:
 			c = judge(s)
 		}
 		d.heatCell(rowY, k, c)