diff --git a/nway-calibrate-cutoff.py b/nway-calibrate-cutoff.py
index 9f03eb5..9b21cde 100644
--- a/nway-calibrate-cutoff.py
+++ b/nway-calibrate-cutoff.py
@@ -88,6 +88,6 @@ def error(self, message):
 		i = numpy.min(numpy.where(mask)[0])
 		#print(i)
 		print('For a false detection rate of <%d%%' % (rate*100))
-		print('--> use only counterparts with p_any>%.2f (%.2f%% of matches)' % (cutoffs[i], efficiency[i]))
+		print('--> use only counterparts with p_any>%.2f (%.2f%% of matches)' % (cutoffs[i], efficiency[i]*100))
 
 
diff --git a/nway-create-fake-catalogue.py b/nway-create-fake-catalogue.py
index bc4215a..1b9875e 100644
--- a/nway-create-fake-catalogue.py
+++ b/nway-create-fake-catalogue.py
@@ -148,6 +148,9 @@ def greatarc_interpolate(posa, posb, f):
 	dmask = d[b_nearest] * 60 * 60 > radius
 	#d = d[dmask]
 	b_nearest = b_nearest[dmask]
+
+	assert len(b_nearest)>0, "Method failed: No sources found nearby, could not interpolate a fake source."
+
 	#print('have %d neighbors' % len(b_nearest))
 	b_nearest = b_nearest[:100]
 	#print('distances:', d[b_nearest] * 60 * 60)