From b31acff1fac56c75b8b300421fdf0b565b55dab8 Mon Sep 17 00:00:00 2001
From: Dejiang Yin <dj.yin@foxmail.com>
Date: Thu, 27 Nov 2025 18:37:53 +0800
Subject: [PATCH] Update candidate.py

---
 src/riptide/candidate.py | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/src/riptide/candidate.py b/src/riptide/candidate.py
index c8f34b3..ee81a78 100644
--- a/src/riptide/candidate.py
+++ b/src/riptide/candidate.py
@@ -232,8 +232,23 @@ def plot_subints(X, T):
     T : float
         Integration time in seconds
     """
-    __, nbins = X.shape
-
+    ##
+    # per-subint normalization (each subint scaled independently)
+    nsubs, nbins = X.shape
+    X_norm = np.zeros_like(X, dtype=np.float32)
+    for i in range(nsubs):
+        row = X[i, :]
+        min_val = row.min()
+        max_val = row.max()
+
+        if np.isclose(min_val, max_val, atol=1e-7):
+            X_norm[i, :] = 0.0
+        else:
+            X_norm[i, :] = (row - min_val) / (max_val - min_val)
+            
+    # use normalized subints for plotting
+    X = X_norm
+    ##
     X = np.hstack((X, X[:, : nbins // 2]))
     __, nbins_ext = X.shape