From a1a3dcfe233df8719b4b8b181509dc32acfefe57 Mon Sep 17 00:00:00 2001
From: Pey Lian Lim <lim@stsci.edu>
Date: Tue, 6 Sep 2016 16:12:03 -0400
Subject: [PATCH] Fix overlap check for Box now that it is considered an
 analytic spectrum

---
 pysynphot/spectrum.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pysynphot/spectrum.py b/pysynphot/spectrum.py
index 1b667396..d94a7c25 100644
--- a/pysynphot/spectrum.py
+++ b/pysynphot/spectrum.py
@@ -2083,8 +2083,8 @@ def check_overlap(self, other):
             Overlap status.
 
         """
-        if other.isAnalytic:
-            # then it's defined everywhere
+        if other.isAnalytic and not isinstance(other, Box):
+            # then it's defined everywhere, except for Box
             return 'full'
 
         swave = self.wave[N.where(self.throughput != 0)]