diff --git a/views.py b/views.py
index b537450..5ec9eeb 100644
--- a/views.py
+++ b/views.py
@@ -167,6 +167,15 @@ class UpperLimitView(APIView):
 
         map_radius_value = request.query_params.get("mr")
 
+        # DEFINE APERTURE AND ANNULUS RADII
+        # **************************************************************
+
+        aperture_radius = 71  # radius of the aperture in arc seconds
+        # HPD ~48 arcseconds
+        # 90% ~100 arcseconds
+        annulus_inner = 142  # 2 * aperture_radius
+        annulus_outer = 284  # 4 * aperture_radius
+
         # default value if not specified in the query
         # get hpids within a circle of radius sqrt(2) * outer annulus radius
         if map_radius_value is None:
@@ -182,15 +191,6 @@ class UpperLimitView(APIView):
         gal = src_coord.galactic
         src_vec = hp.ang2vec(gal.l.deg, gal.b.deg, lonlat=True)
 
-        # DEFINE APERTURE AND ANNULUS RADII
-        # **************************************************************
-
-        aperture_radius = 71  # radius of the aperture in arc seconds
-        # HPD ~48 arcseconds
-        # 90% ~100 arcseconds
-        annulus_inner = 142  # 2 * aperture_radius
-        annulus_outer = 284  # 4 * aperture_radius
-
         # FETCH PIXEL DATA DEFINED VIA HP.QUERY_DISC (INCLUSIVE=FALSE)
         # **************************************************************