From cb4ff822c92c056b2cd898bd57984fcfa750d624 Mon Sep 17 00:00:00 2001
From: Christopher Mayes <31023527+ChristopherMayes@users.noreply.github.com>
Date: Mon, 16 Dec 2024 09:58:49 -0800
Subject: [PATCH] forgot `_` in `cov_`

---
 pmd_beamphysics/particles.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pmd_beamphysics/particles.py b/pmd_beamphysics/particles.py
index 8a5f850..d990378 100644
--- a/pmd_beamphysics/particles.py
+++ b/pmd_beamphysics/particles.py
@@ -788,7 +788,7 @@ def __getitem__(self, key):
             return self["z"] / (c_light)
 
         if key.startswith("cov_"):
-            subkeys = key.removeprefix("cov").split("__")
+            subkeys = key.removeprefix("cov_").split("__")
             assert (
                 len(subkeys) == 2
             ), f"Too many properties in covariance request: {key}"