diff --git a/views.py b/views.py
index 5ec9eeb..e626adc 100644
--- a/views.py
+++ b/views.py
@@ -395,13 +395,13 @@ class UpperLimitView(APIView):
         # refine belt to circular region using astropy separation
         for catsrc in belt_sources:
             catsrc_coord = SkyCoord(catsrc.ra_deg, catsrc.dec_deg, unit="deg")
-            separation = center_coord.separation(catsrc_coord).deg
-            if separation > radius_deg:
+            separation = center_coord.separation(catsrc_coord)
+            if separation.deg > radius_deg:
                 continue
             f = catsrc.flux or 0.0
             for lb in reversed(sorted_bounds):
                 if f >= lb:
-                    mask_radius = radius_map[lb]
+                    mask_radius = radius_map[lb] * 3600
                     break
 
             nearby_sources.append(
@@ -417,8 +417,8 @@ class UpperLimitView(APIView):
                     "catalog_name": catsrc.catalog_name,
                     "new_xray": catsrc.new_xray,
                     "source_type": catsrc.source_type,
-                    "mask_radius_deg": mask_radius,
-                    "separation_deg": separation,
+                    "mask_radius_as": mask_radius,
+                    "separation_as": separation.arcsecond,
                 }
             )