diff --git a/rfg_vna_viewer.py b/rfg_vna_viewer.py
index a4d074f..8ba5499 100644
--- a/rfg_vna_viewer.py
+++ b/rfg_vna_viewer.py
@@ -193,10 +193,14 @@ def process_reference(ref_ch1, ref_ch2, ref_phase_first, freqs_hz):
 
 
 def process_main(main_ch1, main_ch2, ref_amplitude, ref_phase_aligned):
-    """Normalize main channel by reference. Return (amp, phase, fft_mag, fft_dist)."""
+    """Normalize main channel by reference.
+
+    Returns (main_amp, ref_amp, amp_norm, phase_norm, fft_mag, fft_dist).
+    """
     ch1_v = main_ch1 * TTY_SCALE
     ch2_v = main_ch2 * TTY_SCALE
     z_main = ch1_v + 1j * ch2_v
+    main_amp = np.abs(z_main)
 
     z_ref = ref_amplitude * np.exp(1j * ref_phase_aligned)
     z_ref_safe = np.where(np.abs(z_ref) > 1e-12, z_ref, 1e-12 + 0j)
@@ -215,7 +219,7 @@ def process_main(main_ch1, main_ch2, ref_amplitude, ref_phase_aligned):
     dist_step = C_M_S / (2.0 * FFT_LEN * df_hz)
     fft_dist = np.arange(FFT_LEN // 2) * dist_step
 
-    return amp_norm, phase_norm, fft_mag, fft_dist
+    return main_amp, ref_amplitude, amp_norm, phase_norm, fft_mag, fft_dist
 
 
 # ---------------------------------------------------------------------------
@@ -227,33 +231,46 @@ def build_gui():
     win = pg.GraphicsLayoutWidget(show=True, title="RFG VNA Viewer")
     win.resize(1200, 800)
 
-    p_amp = win.addPlot(row=0, col=0, title="Нормированная амплитуда |S|")
-    p_amp.showGrid(x=True, y=True, alpha=0.3)
-    p_amp.setLabel("bottom", "Частота", units="ГГц")
-    p_amp.setLabel("left", "Амплитуда")
-    c_amp = p_amp.plot(pen=pg.mkPen((80, 120, 255), width=1))
+    # Row 0: raw amplitudes of both channels
+    p_raw = win.addPlot(row=0, col=0, title="Амплитуды каналов")
+    p_raw.showGrid(x=True, y=True, alpha=0.3)
+    p_raw.setLabel("bottom", "Частота", units="ГГц")
+    p_raw.setLabel("left", "Амплитуда", units="В")
+    p_raw.addLegend(offset=(10, 10))
+    c_main_amp = p_raw.plot(pen=pg.mkPen((80, 120, 255), width=1), name="Main (0a00)")
+    c_ref_amp = p_raw.plot(pen=pg.mkPen((255, 80, 80), width=1), name="Ref (a800)")
 
-    p_ph = win.addPlot(row=1, col=0, title="Нормированная фаза arg(S)")
+    # Row 1: normalized amplitude
+    p_norm = win.addPlot(row=1, col=0, title="Нормированная амплитуда |S|")
+    p_norm.showGrid(x=True, y=True, alpha=0.3)
+    p_norm.setLabel("bottom", "Частота", units="ГГц")
+    p_norm.setLabel("left", "Амплитуда")
+    p_norm.setXLink(p_raw)
+    c_norm_amp = p_norm.plot(pen=pg.mkPen((80, 120, 255), width=1))
+
+    # Row 2: normalized phase
+    p_ph = win.addPlot(row=2, col=0, title="Нормированная фаза arg(S)")
     p_ph.showGrid(x=True, y=True, alpha=0.3)
     p_ph.setLabel("bottom", "Частота", units="ГГц")
     p_ph.setLabel("left", "Фаза", units="рад")
-    p_ph.setXLink(p_amp)
+    p_ph.setXLink(p_raw)
     c_ph = p_ph.plot(pen=pg.mkPen((230, 180, 40), width=1))
 
-    p_fft = win.addPlot(row=2, col=0, title="FFT — расстояние")
+    # Row 3: FFT distance
+    p_fft = win.addPlot(row=3, col=0, title="FFT — расстояние")
     p_fft.showGrid(x=True, y=True, alpha=0.3)
     p_fft.setLabel("bottom", "Расстояние", units="м")
     p_fft.setLabel("left", "Магнитуда", units="дБ")
     c_fft = p_fft.plot(pen=pg.mkPen((60, 200, 80), width=1))
 
-    return app, win, (c_amp, c_ph, c_fft)
+    return app, win, (c_main_amp, c_ref_amp, c_norm_amp, c_ph, c_fft)
 
 
 # ---------------------------------------------------------------------------
 # Update loop
 # ---------------------------------------------------------------------------
 def make_update(reader, accumulator, curves):
-    c_amp, c_ph, c_fft = curves
+    c_main_amp, c_ref_amp, c_norm_amp, c_ph, c_fft = curves
     state = {"ref_phase_first": None}
 
     def update():
@@ -277,11 +294,13 @@ def make_update(reader, accumulator, curves):
             sweep["ref_ch1"], sweep["ref_ch2"], state["ref_phase_first"], freqs_hz
         )
 
-        amp, phase, fft_mag, fft_dist = process_main(
+        main_amp, ref_amplitude, norm_amp, phase, fft_mag, fft_dist = process_main(
             sweep["main_ch1"], sweep["main_ch2"], ref_amp, ref_phase
         )
 
-        c_amp.setData(freqs_ghz, amp)
+        c_main_amp.setData(freqs_ghz, main_amp)
+        c_ref_amp.setData(freqs_ghz, ref_amplitude)
+        c_norm_amp.setData(freqs_ghz, norm_amp)
         c_ph.setData(freqs_ghz, phase)
 
         fft_db = 20.0 * np.log10(fft_mag + 1e-12)