diff --git a/driveAtlas.sh b/driveAtlas.sh
index 24461c9..e937812 100644
--- a/driveAtlas.sh
+++ b/driveAtlas.sh
@@ -1375,8 +1375,8 @@ generate_zimaboard_layout() {
     # heatsink fin ramp: period-4 ridge, lit from upper-left
     _zfin() {
         case $(( (($1%4)+4)%4 )) in
-            0) _zp "$2" "$3" '█' H ;;
-            1) _zp "$2" "$3" '▓' H ;;
+            0) _zp "$2" "$3" '█' S ;;
+            1) _zp "$2" "$3" '▓' S ;;
             2) _zp "$2" "$3" '▒' S ;;
             3) _zp "$2" "$3" '░' S ;;
         esac