diff --git a/sql/s15/q11.sql b/sql/s15/q11.sql
new file mode 100644
index 0000000000000000000000000000000000000000..77d93a8128e26e17cc9e6b08d72744acd7a7ef58
--- /dev/null
+++ b/sql/s15/q11.sql
@@ -0,0 +1,3 @@
+select count(*) from Object o, Source s 
+ WHERE o.deepSourceId=s.objectId 
+   AND s.flux_sinc BETWEEN 0.13 AND 0.14;
