diff --git a/README b/README
index 16ee774..6545880 100644
--- a/README
+++ b/README
@@ -1,6 +1,3 @@
-
-
-
 Installing into private directory
 =================================
 
diff --git a/src/data/DamarisFFT.py b/src/data/DamarisFFT.py
index a5af062..e29998f 100644
--- a/src/data/DamarisFFT.py
+++ b/src/data/DamarisFFT.py
@@ -233,5 +233,6 @@ class DamarisFFT:
         :param f_ref: larmor frequency in Hz
         :return:
         """
-        self.y /= f_ref*1e6
+        self.x /= f_ref*1e6
+        self.set_xlabel( "PPM" )
         return self
\ No newline at end of file
diff --git a/tests/exp_test.py b/tests/exp_test.py
index ad73319..df72a6e 100644
--- a/tests/exp_test.py
+++ b/tests/exp_test.py
@@ -7,5 +7,5 @@ def test():
     return e
 
 def experiment():
-    for i in range(1000):
+    for i in range(100):
         yield test()
\ No newline at end of file
diff --git a/tests/res_test.py b/tests/res_test.py
index e841ab1..d8db347 100644
--- a/tests/res_test.py
+++ b/tests/res_test.py
@@ -1,4 +1,6 @@
 def result():
     for num,ts in enumerate(results):
-    	data["ts %i"%num] = ts
+        data["ts %i"%num] = ts+0
+        data["fft"] = (ts+0).fft()
+        data["ppm"] = (ts+0).fft().ppm(300e6)
         #print ts
\ No newline at end of file