diff -r aec67cdd6b14 -r efa60bc4f743 src/dataterm.rs
--- a/src/dataterm.rs	Tue Aug 01 10:32:12 2023 +0300
+++ b/src/dataterm.rs	Thu Aug 29 00:00:00 2024 -0500
@@ -46,7 +46,7 @@
 ) -> V {
     let mut r = b.clone();
     opA.gemv(&mut r, 1.0, μ, -1.0);
-    opA.gemv(&mut r, 1.0, μ_delta, -1.0);
+    opA.gemv(&mut r, 1.0, μ_delta, 1.0);
     r
 }