diff --git a/test.py b/test.py
index e30f93ee..a9d69dce 100644
--- a/test.py
+++ b/test.py
@@ -238,12 +238,11 @@ if __name__ == '__main__':
     else:
         # Parameter study
         y = []
-        x = np.arange(0.3, 0.9, 0.02)
+        x = np.arange(0.3, 0.9, 0.1)
         for v in x:
             t = time.time()
             r = test(opt.cfg, opt.data, opt.weights, opt.batch_size, opt.img_size, opt.conf_thres, v, opt.save_json)[0]
-            dt = [time.time() - t]
-            y.append(r + dt)
+            y.append(r + (time.time() - t,))
         y = np.stack(y, 0)
 
         # Plot