diff --git a/datalets/scatterplot-matrix-datalet/demo/index.html b/datalets/scatterplot-matrix-datalet/demo/index.html
index f066ba7..4720686 100644
--- a/datalets/scatterplot-matrix-datalet/demo/index.html
+++ b/datalets/scatterplot-matrix-datalet/demo/index.html
@@ -14,8 +14,9 @@
 <link rel="import" href="../scatterplot-matrix-datalet.html" />
 
 <div style="width:auto;">
-    <scatterplot-matrix-datalet category-key="regione" cell-size="250" data-url="http://ckan.ancitel.it/api/action/datastore_search?resource_id=29d9700a-fb2c-45fe-9cea-da856d5afd6c&limit=500"
-                                fields='"result,records,pop_residente","result,records,superficie_kmq","result,records,dens_demografica"]'></scatterplot-matrix-datalet>
+
+    <scatterplot-matrix-datalet cell-size="250" data-url="http://ckan.ancitel.it/api/action/datastore_search?resource_id=29d9700a-fb2c-45fe-9cea-da856d5afd6c&limit=500"
+                                fields='["result,records,pop_residente","result,records,superficie_kmq","result,records,dens_demografica"]'></scatterplot-matrix-datalet>
 </div>