diff --git a/dist/features/lc-ms/entities/timeAxis.js b/dist/features/lc-ms/entities/timeAxis.js
new file mode 100644
index 00000000..99d34ae0
--- /dev/null
+++ b/dist/features/lc-ms/entities/timeAxis.js
@@ -0,0 +1,130 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.reconcileLcMsTimeAxes = exports.maxTimeOf = exports.default = void 0;
+var _extractEntityLCMS = require("./extractEntityLCMS");
+const SECONDS_PER_MINUTE = 60;
+
+// Every member of an LC/MS group describes one injection, so their retention-time axes
+// must mean the same thing. A converter can get that wrong for a single file:
+// chemotion-converter-app 1.9.3 emits the UV/VIS axis in seconds while labelling it
+// `##XUNITS=MINUTES` (and the `##UNITS` X slot agrees), so nothing inside that file
+// contradicts the label and no per-file heuristic can catch it - chem.js's own
+// seconds-to-minutes pass is vetoed by the explicit MINUTES it declares.
+//
+// The sibling TIC is the independent evidence. Both cover the same run, so their spans
+// should be comparable; a UV/VIS span some 60x its TIC's is a unit mismatch rather than a
+// longer run. Observed: a UV/VIS of 0..599.825 "minutes" beside a TIC of 0.005..9.999,
+// a ratio of 59.99, where the same instrument's healthy exports sit near 1 (19.96 vs
+// 15.98 = 1.25). The window below is therefore far from any plausible true ratio.
+const MIN_SECONDS_RATIO = 30;
+const MAX_SECONDS_RATIO = 120;
+const finite = value => {
+  const num = Number(value);
+  return Number.isFinite(num) ? num : null;
+};
+
+// The largest x across a curve's blocks. Reads features and spectra alike, since an entity
+// carries the same data under both and either may be the populated one.
+const maxTimeOf = entity => {
+  const blocks = [].concat(Array.isArray(entity?.features) ? entity.features : []).concat(Array.isArray(entity?.spectra) ? entity.spectra : []);
+  let max = null;
+  blocks.forEach(block => {
+    const xs = block?.data?.[0]?.x;
+    if (!Array.isArray(xs)) return;
+    xs.forEach(value => {
+      const num = finite(value);
+      if (num !== null && (max === null || num > max)) max = num;
+    });
+  });
+  return max;
+};
+
+// Scales every x-bearing field a curve carries. Mirrors the field list chem.js already
+// scales when it converts at parse time (data blocks, peaks, integrations and the cached
+// extrema), so a curve corrected here is indistinguishable from one that arrived correct.
+exports.maxTimeOf = maxTimeOf;
+const scaleBlock = (block, factor) => {
+  if (!block) return block;
+  const scale = value => {
+    const num = finite(value);
+    return num === null ? value : num * factor;
+  };
+  const next = {
+    ...block
+  };
+  if (Array.isArray(block.data)) {
+    next.data = block.data.map(d => Array.isArray(d?.x) ? {
+      ...d,
+      x: d.x.map(scale)
+    } : d);
+  }
+  if (Array.isArray(block.peaks)) {
+    next.peaks = block.peaks.map(p => ({
+      ...p,
+      x: scale(p.x)
+    }));
+  }
+  if (Array.isArray(block.integrations)) {
+    next.integrations = block.integrations.map(integ => ({
+      ...integ,
+      xL: scale(integ.xL),
+      xU: scale(integ.xU),
+      xExtent: integ.xExtent ? {
+        ...integ.xExtent,
+        xL: scale(integ.xExtent.xL),
+        xU: scale(integ.xExtent.xU)
+      } : integ.xExtent
+    }));
+  }
+  if (block.maxX !== undefined) next.maxX = scale(block.maxX);
+  if (block.minX !== undefined) next.minX = scale(block.minX);
+  // The declared unit was the thing that was wrong; leave it agreeing with the data.
+  if (typeof block.xUnit === 'string' && /SECOND|MINUTE|TIME/i.test(block.xUnit)) {
+    next.xUnit = 'MINUTES';
+  }
+  return next;
+};
+const scaleEntityTime = (entity, factor) => {
+  const next = {
+    ...entity
+  };
+  if (Array.isArray(entity.features)) {
+    next.features = entity.features.map(f => scaleBlock(f, factor));
+  }
+  if (Array.isArray(entity.spectra)) {
+    next.spectra = entity.spectra.map(s => scaleBlock(s, factor));
+  }
+  return next;
+};
+
+/**
+ * Reconciles the retention-time axes of an LC/MS group against each other, correcting a
+ * UV/VIS trace that arrived in seconds behind a MINUTES label.
+ *
+ * Deliberately one-directional: only the UV/VIS is adjusted, and only against a TIC. A TIC
+ * that is itself in seconds is chem.js's job, at parse time, where the file's own units
+ * still say so. Returns the input untouched when there is nothing to reconcile, so callers
+ * can apply it unconditionally.
+ */
+const reconcileLcMsTimeAxes = (entities = []) => {
+  if (!Array.isArray(entities) || entities.length < 2) return entities;
+  const kinds = entities.map(e => (0, _extractEntityLCMS.getLcMsInfo)(e).kind);
+  const ticMax = entities.filter((_, i) => kinds[i] === 'tic').map(maxTimeOf).filter(v => v !== null && v > 0).reduce((acc, v) => acc === null || v > acc ? v : acc, null);
+  if (ticMax === null) return entities;
+  let changed = false;
+  const next = entities.map((entity, i) => {
+    if (kinds[i] !== 'uvvis') return entity;
+    const uvvisMax = maxTimeOf(entity);
+    if (uvvisMax === null || uvvisMax <= 0) return entity;
+    const ratio = uvvisMax / ticMax;
+    if (ratio < MIN_SECONDS_RATIO || ratio > MAX_SECONDS_RATIO) return entity;
+    changed = true;
+    return scaleEntityTime(entity, 1 / SECONDS_PER_MINUTE);
+  });
+  return changed ? next : entities;
+};
+exports.reconcileLcMsTimeAxes = reconcileLcMsTimeAxes;
+var _default = exports.default = reconcileLcMsTimeAxes;
\ No newline at end of file
diff --git a/dist/layer_init.js b/dist/layer_init.js
index 17fd8df5..f9b369d3 100644
--- a/dist/layer_init.js
+++ b/dist/layer_init.js
@@ -18,6 +18,7 @@ var _jcamp = require("./actions/jcamp");
 var _layer_prism = _interopRequireDefault(require("./layer_prism"));
 var _format = _interopRequireDefault(require("./helpers/format"));
 var _extractEntityLCMS = require("./helpers/extractEntityLCMS");
+var _timeAxis = require("./features/lc-ms/entities/timeAxis");
 var _multi_jcamps_viewer = _interopRequireDefault(require("./components/multi_jcamps_viewer"));
 var _hplc_viewer = _interopRequireDefault(require("./components/hplc_viewer"));
 var _curve = require("./actions/curve");
@@ -196,12 +197,12 @@ class LayerInit extends _react.default.Component {
     const isMultiSpectra = Array.isArray(multiEntities) && multiEntities.length > 1;
     if (isMultiSpectra) {
       const meta = _format.default.isLCMsLayout(entity.layout) ? lcmsCurveMeta() : undefined;
-      setAllCurvesAct(multiEntities, meta);
+      setAllCurvesAct((0, _timeAxis.reconcileLcMsTimeAxes)(multiEntities), meta);
       return;
     }
     if (_format.default.isLCMsLayout(entity.layout)) {
       const payload = Array.isArray(multiEntities) && multiEntities.length > 0 ? multiEntities : [entity];
-      setAllCurvesAct(payload, lcmsCurveMeta());
+      setAllCurvesAct((0, _timeAxis.reconcileLcMsTimeAxes)(payload), lcmsCurveMeta());
       return;
     }
     if (_format.default.isCyclicVoltaLayout(entity.layout)) {
diff --git a/src/__tests__/units/features/lc-ms/entities/timeAxis.test.js b/src/__tests__/units/features/lc-ms/entities/timeAxis.test.js
new file mode 100644
index 00000000..0d1f60a7
--- /dev/null
+++ b/src/__tests__/units/features/lc-ms/entities/timeAxis.test.js
@@ -0,0 +1,120 @@
+import { reconcileLcMsTimeAxes, maxTimeOf } from '../../../../../features/lc-ms/entities/timeAxis';
+
+// Shaped after the real converter output. example2 (X32962) emits a UV/VIS axis in seconds
+// labelled `##XUNITS=MINUTES` beside a TIC in genuine minutes; example1 (SVS-486F3) is
+// consistent. The numbers below are the measured spans of those two datasets.
+const uvvis = (maxX, extra = {}) => ({
+  layout: 'LC/MS',
+  spectra: [{
+    dataType: 'HPLC UV-VIS',
+    csCategory: 'UVVIS PEAK TABLE',
+    xUnit: 'MINUTES',
+    data: [{ x: [0, maxX / 2, maxX], y: [1, 2, 3] }],
+    maxX,
+    minX: 0,
+    ...extra,
+  }],
+});
+
+const tic = (maxX) => ({
+  layout: 'LC/MS',
+  spectra: [{
+    dataType: 'MASS TIC',
+    xUnit: 'MINUTES',
+    data: [{ x: [0, maxX / 2, maxX], y: [10, 20, 30] }],
+  }],
+});
+
+const mz = (maxX) => ({
+  layout: 'LC/MS',
+  spectra: [{
+    dataType: 'MASS SPECTRUM',
+    xUnit: 'm/z',
+    page: 'T= 1.0',
+    pageValue: 1.0,
+    data: [{ x: [100, maxX / 2, maxX], y: [5, 6, 7] }],
+  }],
+});
+
+const xOf = (entity) => entity.spectra[0].data[0].x;
+
+describe('reconcileLcMsTimeAxes', () => {
+  it('rescales a UV/VIS trace that is ~60x its TIC, the example2 case', () => {
+    const [fixedUvvis, fixedTic] = reconcileLcMsTimeAxes([uvvis(599.825), tic(9.9994)]);
+    expect(xOf(fixedUvvis)[2]).toBeCloseTo(9.997, 3);
+    // the TIC is the reference and must not move
+    expect(xOf(fixedTic)[2]).toBeCloseTo(9.9994, 4);
+  });
+
+  it('leaves a consistent group alone, the example1 case', () => {
+    const entities = [uvvis(19.9613), tic(15.98)];
+    const out = reconcileLcMsTimeAxes(entities);
+    // returned by reference, so an unnecessary re-render is not triggered either
+    expect(out).toBe(entities);
+    expect(xOf(out[0])[2]).toBeCloseTo(19.9613, 4);
+  });
+
+  it('never rescales the m/z entity, whose x is m/z rather than time', () => {
+    // m/z runs to ~1450 against a 10-minute TIC; only the kind gate keeps it safe if the
+    // ratio window is ever widened.
+    const entities = [mz(1448.2), tic(9.9994)];
+    const out = reconcileLcMsTimeAxes(entities);
+    expect(xOf(out[0])[2]).toBeCloseTo(1448.2, 3);
+  });
+
+  it('does nothing without a TIC to compare against', () => {
+    const entities = [uvvis(599.825), mz(1448.2)];
+    expect(reconcileLcMsTimeAxes(entities)).toBe(entities);
+  });
+
+  it('does nothing for a lone entity, or a non-array input', () => {
+    const one = [uvvis(599.825)];
+    expect(reconcileLcMsTimeAxes(one)).toBe(one);
+    expect(reconcileLcMsTimeAxes([])).toEqual([]);
+    expect(reconcileLcMsTimeAxes(undefined)).toEqual([]);
+  });
+
+  it('ignores a ratio that is merely large but not a unit mismatch', () => {
+    // 20x is not 60x: a real span difference, however odd, is not evidence of seconds.
+    const entities = [uvvis(200), tic(10)];
+    expect(reconcileLcMsTimeAxes(entities)).toBe(entities);
+  });
+
+  it('scales peaks, integrations and the cached extrema, not just the data block', () => {
+    const entities = [
+      uvvis(599.825, {
+        peaks: [{ x: 300, y: 5 }],
+        integrations: [{ xL: 60, xU: 120, xExtent: { xL: 60, xU: 120 } }],
+      }),
+      tic(9.9994),
+    ];
+    const [fixed] = reconcileLcMsTimeAxes(entities);
+    const s = fixed.spectra[0];
+    expect(s.peaks[0].x).toBeCloseTo(5, 6);
+    expect(s.integrations[0].xL).toBeCloseTo(1, 6);
+    expect(s.integrations[0].xU).toBeCloseTo(2, 6);
+    expect(s.integrations[0].xExtent).toEqual({ xL: 1, xU: 2 });
+    expect(s.maxX).toBeCloseTo(9.997, 3);
+    expect(s.minX).toBeCloseTo(0, 6);
+    // the label was the thing that lied; leave it agreeing with the data
+    expect(s.xUnit).toEqual('MINUTES');
+  });
+
+  it('does not mutate the entities it was given', () => {
+    const entities = [uvvis(599.825), tic(9.9994)];
+    reconcileLcMsTimeAxes(entities);
+    expect(xOf(entities[0])[2]).toBeCloseTo(599.825, 3);
+  });
+});
+
+describe('maxTimeOf', () => {
+  it('reads the largest x across data blocks', () => {
+    expect(maxTimeOf(tic(9.9994))).toBeCloseTo(9.9994, 4);
+  });
+
+  it('returns null when there is no usable x', () => {
+    expect(maxTimeOf({})).toBeNull();
+    expect(maxTimeOf({ spectra: [{ data: [{ x: [] }] }] })).toBeNull();
+    expect(maxTimeOf({ spectra: [{ data: [{ x: [NaN, undefined] }] }] })).toBeNull();
+  });
+});
diff --git a/src/features/lc-ms/entities/timeAxis.js b/src/features/lc-ms/entities/timeAxis.js
new file mode 100644
index 00000000..0ba7d0ee
--- /dev/null
+++ b/src/features/lc-ms/entities/timeAxis.js
@@ -0,0 +1,128 @@
+import { getLcMsInfo } from './extractEntityLCMS';
+
+const SECONDS_PER_MINUTE = 60;
+
+// Every member of an LC/MS group describes one injection, so their retention-time axes
+// must mean the same thing. A converter can get that wrong for a single file:
+// chemotion-converter-app 1.9.3 emits the UV/VIS axis in seconds while labelling it
+// `##XUNITS=MINUTES` (and the `##UNITS` X slot agrees), so nothing inside that file
+// contradicts the label and no per-file heuristic can catch it - chem.js's own
+// seconds-to-minutes pass is vetoed by the explicit MINUTES it declares.
+//
+// The sibling TIC is the independent evidence. Both cover the same run, so their spans
+// should be comparable; a UV/VIS span some 60x its TIC's is a unit mismatch rather than a
+// longer run. Observed: a UV/VIS of 0..599.825 "minutes" beside a TIC of 0.005..9.999,
+// a ratio of 59.99, where the same instrument's healthy exports sit near 1 (19.96 vs
+// 15.98 = 1.25). The window below is therefore far from any plausible true ratio.
+const MIN_SECONDS_RATIO = 30;
+const MAX_SECONDS_RATIO = 120;
+
+const finite = (value) => {
+  const num = Number(value);
+  return Number.isFinite(num) ? num : null;
+};
+
+// The largest x across a curve's blocks. Reads features and spectra alike, since an entity
+// carries the same data under both and either may be the populated one.
+export const maxTimeOf = (entity) => {
+  const blocks = []
+    .concat(Array.isArray(entity?.features) ? entity.features : [])
+    .concat(Array.isArray(entity?.spectra) ? entity.spectra : []);
+  let max = null;
+  blocks.forEach((block) => {
+    const xs = block?.data?.[0]?.x;
+    if (!Array.isArray(xs)) return;
+    xs.forEach((value) => {
+      const num = finite(value);
+      if (num !== null && (max === null || num > max)) max = num;
+    });
+  });
+  return max;
+};
+
+// Scales every x-bearing field a curve carries. Mirrors the field list chem.js already
+// scales when it converts at parse time (data blocks, peaks, integrations and the cached
+// extrema), so a curve corrected here is indistinguishable from one that arrived correct.
+const scaleBlock = (block, factor) => {
+  if (!block) return block;
+  const scale = (value) => {
+    const num = finite(value);
+    return num === null ? value : num * factor;
+  };
+  const next = { ...block };
+
+  if (Array.isArray(block.data)) {
+    next.data = block.data.map((d) => (
+      Array.isArray(d?.x) ? { ...d, x: d.x.map(scale) } : d
+    ));
+  }
+  if (Array.isArray(block.peaks)) {
+    next.peaks = block.peaks.map((p) => ({ ...p, x: scale(p.x) }));
+  }
+  if (Array.isArray(block.integrations)) {
+    next.integrations = block.integrations.map((integ) => ({
+      ...integ,
+      xL: scale(integ.xL),
+      xU: scale(integ.xU),
+      xExtent: integ.xExtent
+        ? { ...integ.xExtent, xL: scale(integ.xExtent.xL), xU: scale(integ.xExtent.xU) }
+        : integ.xExtent,
+    }));
+  }
+  if (block.maxX !== undefined) next.maxX = scale(block.maxX);
+  if (block.minX !== undefined) next.minX = scale(block.minX);
+  // The declared unit was the thing that was wrong; leave it agreeing with the data.
+  if (typeof block.xUnit === 'string' && /SECOND|MINUTE|TIME/i.test(block.xUnit)) {
+    next.xUnit = 'MINUTES';
+  }
+  return next;
+};
+
+const scaleEntityTime = (entity, factor) => {
+  const next = { ...entity };
+  if (Array.isArray(entity.features)) {
+    next.features = entity.features.map((f) => scaleBlock(f, factor));
+  }
+  if (Array.isArray(entity.spectra)) {
+    next.spectra = entity.spectra.map((s) => scaleBlock(s, factor));
+  }
+  return next;
+};
+
+/**
+ * Reconciles the retention-time axes of an LC/MS group against each other, correcting a
+ * UV/VIS trace that arrived in seconds behind a MINUTES label.
+ *
+ * Deliberately one-directional: only the UV/VIS is adjusted, and only against a TIC. A TIC
+ * that is itself in seconds is chem.js's job, at parse time, where the file's own units
+ * still say so. Returns the input untouched when there is nothing to reconcile, so callers
+ * can apply it unconditionally.
+ */
+export const reconcileLcMsTimeAxes = (entities = []) => {
+  if (!Array.isArray(entities) || entities.length < 2) return entities;
+
+  const kinds = entities.map((e) => getLcMsInfo(e).kind);
+  const ticMax = entities
+    .filter((_, i) => kinds[i] === 'tic')
+    .map(maxTimeOf)
+    .filter((v) => v !== null && v > 0)
+    .reduce((acc, v) => (acc === null || v > acc ? v : acc), null);
+  if (ticMax === null) return entities;
+
+  let changed = false;
+  const next = entities.map((entity, i) => {
+    if (kinds[i] !== 'uvvis') return entity;
+    const uvvisMax = maxTimeOf(entity);
+    if (uvvisMax === null || uvvisMax <= 0) return entity;
+
+    const ratio = uvvisMax / ticMax;
+    if (ratio < MIN_SECONDS_RATIO || ratio > MAX_SECONDS_RATIO) return entity;
+
+    changed = true;
+    return scaleEntityTime(entity, 1 / SECONDS_PER_MINUTE);
+  });
+
+  return changed ? next : entities;
+};
+
+export default reconcileLcMsTimeAxes;
diff --git a/src/layer_init.js b/src/layer_init.js
index f9804c5a..7456c183 100644
--- a/src/layer_init.js
+++ b/src/layer_init.js
@@ -17,6 +17,7 @@ import { addOthers } from './actions/jcamp';
 import LayerPrism from './layer_prism';
 import Format from './helpers/format';
 import { getLcMsInfo, isLcMsGroup } from './helpers/extractEntityLCMS';
+import { reconcileLcMsTimeAxes } from './features/lc-ms/entities/timeAxis';
 import MultiJcampsViewer from './components/multi_jcamps_viewer';
 import HPLCViewer from './components/hplc_viewer';
 import { setAllCurves } from './actions/curve';
@@ -182,7 +183,7 @@ class LayerInit extends React.Component {
     const isMultiSpectra = Array.isArray(multiEntities) && multiEntities.length > 1;
     if (isMultiSpectra) {
       const meta = Format.isLCMsLayout(entity.layout) ? lcmsCurveMeta() : undefined;
-      setAllCurvesAct(multiEntities, meta);
+      setAllCurvesAct(reconcileLcMsTimeAxes(multiEntities), meta);
       return;
     }
 
@@ -190,7 +191,7 @@ class LayerInit extends React.Component {
       const payload = (Array.isArray(multiEntities) && multiEntities.length > 0)
         ? multiEntities
         : [entity];
-      setAllCurvesAct(payload, lcmsCurveMeta());
+      setAllCurvesAct(reconcileLcMsTimeAxes(payload), lcmsCurveMeta());
       return;
     }