diff --git a/src/pg_rad/data/angular_efficiencies/LU_HPGe_90.csv b/src/pg_rad/data/angular_efficiencies/LU_HPGe_90.csv
index e71ec6d..6d11df0 100644
--- a/src/pg_rad/data/angular_efficiencies/LU_HPGe_90.csv
+++ b/src/pg_rad/data/angular_efficiencies/LU_HPGe_90.csv
@@ -18,6 +18,7 @@ angle,662,1173,1332
 160,1.113,1.096,1.099
 170,1.091,1.076,1.083
 180,1.076,1.066,1.078
+-180,1.076,1.066,1.078
 -170,1.102,1.091,1.093
 -160,1.122,1.100,1.102
 -150,1.128,1.105,1.093