From 688218a9c7c3a2b487ce50b4a00ffcab674062f0 Mon Sep 17 00:00:00 2001
From: jikim1290 <jikim1290@gmail.com>
Date: Mon, 22 Jun 2026 11:09:52 +0900
Subject: [PATCH] add q1 selection mode

---
 PWGCF/Flow/Tasks/flowDirectedFlowTask.cxx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/PWGCF/Flow/Tasks/flowDirectedFlowTask.cxx b/PWGCF/Flow/Tasks/flowDirectedFlowTask.cxx
index 394002fd878..c91f1b567e9 100644
--- a/PWGCF/Flow/Tasks/flowDirectedFlowTask.cxx
+++ b/PWGCF/Flow/Tasks/flowDirectedFlowTask.cxx
@@ -279,6 +279,8 @@ struct flowDirectedFlowTask {
       q1 = q1C;
     } else if (cfgq1mode == 3) {
       q1 = q1Mean;
+    } else if (cfgq1mode == 4) {
+      q1 = std::sqrt(std::pow(qxA + qxC, 2) + std::pow(qyA + qyC, 2));
     } else {
       q1 = q1Full;
     }