diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index d03a19dfe..24bf18328 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -24,6 +24,7 @@
 * `jfjoch_broker` sends `direct_beam_x`/`direct_beam_y` on the CBOR start message.
 * `jfjoch_viewer` reads PILATUS miniCBF sweeps natively, and draws grid scan cells in the proportion of the scan steps.
 * The rugnux manual is reorganised into task pages with a run overview, and gains worked phenix / REFMAC5 / POINTLESS-AIMLESS / careless examples.
+* `jfjoch_viewer` labels the merge-statistics plot over the range the axis is drawn on, so the CC1/2 curve is no longer read against tick labels covering only part of it.
 
 ### 1.0.0-rc.165
 This is an UNSTABLE release. It includes many experimental features, as well as many AI generated fixes. We recommend using rc.152 for production use.
diff --git a/viewer/charts/JFJochSimpleChartView.cpp b/viewer/charts/JFJochSimpleChartView.cpp
index e5f7524fe..d0651a540 100644
--- a/viewer/charts/JFJochSimpleChartView.cpp
+++ b/viewer/charts/JFJochSimpleChartView.cpp
@@ -22,7 +22,8 @@ JFJochSimpleChartView::JFJochSimpleChartView(QWidget *parent)
 }
 
 void JFJochSimpleChartView::UpdateData(const std::vector<float> &in_x, const std::vector<float> &in_y,
-                                       QString legend_x, QString legend_y, bool in_one_over_d) {
+                                       QString legend_x, QString legend_y, bool in_one_over_d,
+                                       std::optional<std::pair<double, double>> y_range) {
     one_over_d = in_one_over_d;
     x = in_x;
     y = in_y;
@@ -71,6 +72,13 @@ void JFJochSimpleChartView::UpdateData(const std::vector<float> &in_x, const std
         ymax += eps;
     }
 
+    // A range asked for by the caller replaces the one taken from the data. Everything below - both
+    // axes and the tick labels - is built from ymin/ymax, so the drawn range stays the labelled one.
+    if (y_range && y_range->second > y_range->first) {
+        ymin = y_range->first;
+        ymax = y_range->second;
+    }
+
     // Hidden value axis (left): range + grid
     auto *axYvalue = new QValueAxis();
     axYvalue->setTitleText(legend_y);
diff --git a/viewer/charts/JFJochSimpleChartView.h b/viewer/charts/JFJochSimpleChartView.h
index fcc10a839..4479be9d8 100644
--- a/viewer/charts/JFJochSimpleChartView.h
+++ b/viewer/charts/JFJochSimpleChartView.h
@@ -3,6 +3,9 @@
 
 #pragma once
 
+#include <optional>
+#include <utility>
+
 #include <QtCharts/QChartView>
 #include <QtCharts/QValueAxis>
 #include <QtCharts/QLineSeries>
@@ -24,8 +27,11 @@ protected:
 
 public:
     JFJochSimpleChartView(QWidget *parent = nullptr);
+    // y_range fixes the value range of the Y axis instead of taking it from the data - the tick
+    // labels are built from it, so a caller must not change the range afterwards.
     virtual void UpdateData(const std::vector<float> &in_x, const std::vector<float> &in_y,
-                            QString legend_x, QString legend_y, bool one_over_d);
+                            QString legend_x, QString legend_y, bool one_over_d,
+                            std::optional<std::pair<double, double>> y_range = std::nullopt);
     void ClearData();
 };
 
diff --git a/viewer/windows/JFJochMergeStatsWindow.cpp b/viewer/windows/JFJochMergeStatsWindow.cpp
index 520d6b964..8e77a26ac 100644
--- a/viewer/windows/JFJochMergeStatsWindow.cpp
+++ b/viewer/windows/JFJochMergeStatsWindow.cpp
@@ -322,23 +322,17 @@ void JFJochMergeStatsWindow::updatePlot() {
         if (std::isfinite(v))
             dmax = std::max(dmax, v);
     }
-    chart_->UpdateData(x, y, "Resolution [Å]", metric_->currentText(), true);
-
     // Absolute y-axis so positions are comparable: CC1/2 + CCref are 0..100, completeness 0..(>=100),
-    // multiplicity / R-meas / I-sigma start at 0. Show the labels (UpdateData hides them by default).
-    double ymin = 0.0, ymax = 1.0;
+    // multiplicity / R-meas / I-sigma start at 0. It has to be given to UpdateData rather than set
+    // on the axis afterwards, or the tick labels still describe the range of the data.
+    double ymax = 1.0;
     switch (metric) {
         case 0: case 5: ymax = 100.0; break;                              // CC1/2, CCref
         case 3: ymax = std::max(100.0, dmax * 1.05); break;               // Completeness
         default: ymax = dmax > 0.0 ? dmax * 1.05 : 1.0; break;            // R-meas, I/sigma, multiplicity
     }
-    const auto axes = chart_->chart()->axes(Qt::Vertical);
-    if (!axes.isEmpty()) {
-        if (auto *vax = qobject_cast<QValueAxis *>(axes.first())) {
-            vax->setRange(ymin, ymax);
-            vax->setLabelsVisible(true);
-        }
-    }
+    chart_->UpdateData(x, y, "Resolution [Å]", metric_->currentText(), true,
+                       std::make_pair(0.0, ymax));
 }
 
 void JFJochMergeStatsWindow::buildTable() {