From 890ab9a75de9af6584ba2faabf4dab522fcf90dd Mon Sep 17 00:00:00 2001
From: Luc Patiny <luc@patiny.com>
Date: Mon, 23 Mar 2026 12:00:07 +0100
Subject: [PATCH] fix: use absolute sum for 1D projections from 2D spectra

---
 src/data/data2d/Spectrum2D/getMissingProjection.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/data/data2d/Spectrum2D/getMissingProjection.ts b/src/data/data2d/Spectrum2D/getMissingProjection.ts
index 382edea4d5..3428d5a549 100644
--- a/src/data/data2d/Spectrum2D/getMissingProjection.ts
+++ b/src/data/data2d/Spectrum2D/getMissingProjection.ts
@@ -16,13 +16,13 @@ export function getProjection(datum: NmrData2DFt['rr'], index: number) {
   if (index === 1) {
     for (let i = 0; i < datum.z.length; i++) {
       for (let j = 0; j < datum.z[0].length; j++) {
-        projection[i] += datum.z[i][j];
+        projection[i] += Math.abs(datum.z[i][j]);
       }
     }
   } else {
     for (let i = 0; i < datum.z[0].length; i++) {
       for (const z of datum.z) {
-        projection[i] += z[i];
+        projection[i] += Math.abs(z[i]);
       }
     }
   }