From b00e9f20b74c85dcc14bcbfa8868cd6ccfb1efe2 Mon Sep 17 00:00:00 2001
From: Ed van Gasteren <Ed@vanGasteren.net>
Date: Sun, 26 Apr 2026 17:05:11 +0200
Subject: [PATCH] Correct the Tau mass relative uncertainty.

Tau mass constant had incorrect relative uncertainty.
It was based on Munon values.

Corrected the expression to use Tau values.

Signed-off-by: Ed@vanGasteren.net
---
 src/constants.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/constants.cc b/src/constants.cc
index 590d4782..445956f5 100644
--- a/src/constants.cc
+++ b/src/constants.cc
@@ -644,7 +644,7 @@ static const cstring basic_constants[] =
     // *Tau mass - Measurement
     "mτ",       "[ 1.90754_u "
                 "  0.00013_u "
-                "  'ROUND(UBASE(Ⓢmμ/Ⓒmμ);-2)' ]",
+                "  'ROUND(UBASE(Ⓢmτ/Ⓒmτ);-2)' ]",
 
     // ------------------------------------------------------------------------
     // *mpme ratio - Measurement