diff --git a/LICENSE.md b/LICENSE.md
new file mode 100644
index 0000000000000000000000000000000000000000..623bb684b64352b80a8fd93365a65024effbeff1
--- /dev/null
+++ b/LICENSE.md
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Paul D. Lasky
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/tupak/prior.py b/tupak/prior.py
index 9c7329d25943c58ccbe24122cddb92a07856952c..0fcf64cccd24d41dad3c24e4def6c9699ea1f881 100644
--- a/tupak/prior.py
+++ b/tupak/prior.py
@@ -180,8 +180,6 @@ class Cosine(Prior):
 
     def __init__(self, name=None, latex_label=None):
         Prior.__init__(self, name, latex_label)
-        self.minimum = - np.pi / 2
-        self.maximum = np.pi / 2
 
     def rescale(self, val):
         """
@@ -205,8 +203,6 @@ class Sine(Prior):
 
     def __init__(self, name=None, latex_label=None):
         Prior.__init__(self, name, latex_label)
-        self.minimum = 0
-        self.maximum = np.pi
 
     def rescale(self, val):
         """
diff --git a/tupak/waveform_generator.py b/tupak/waveform_generator.py
index ff169864dde78488965e3c1de769f96ed226ca80..7cab8c75806105a29a6bbc7f02a89756761d3428 100644
--- a/tupak/waveform_generator.py
+++ b/tupak/waveform_generator.py
@@ -35,10 +35,21 @@ class WaveformGenerator(object):
 
     def frequency_domain_strain(self):
         """ Wrapper to source_model """
-        return self.frequency_domain_source_model(self.frequency_array, **self.parameters)
+        if self.frequency_domain_source_model is not None:
+            return self.frequency_domain_source_model(self.frequency_array, **self.parameters)
+        elif self.time_domain_source_model is not None:
+            fft_data, self.frequency_array = utils.nfft(self.time_domain_source_model(self.time_array, **self.parameters), self.sampling_frequency)
+            return fft_data
+        else:
+            raise RuntimeError("No source model given")
 
     def time_domain_strain(self):
-        return self.time_domain_source_model(self.time_array, **self.parameters)
+        if self.time_domain_source_model is not None:
+            return self.time_domain_source_model(self.time_array, **self.parameters)
+        elif self.frequency_domain_source_model is not None:
+            return utils.infft(self.frequency_domain_source_model(self.frequency_array, **self.parameters))
+        else:
+            raise RuntimeError("No source model given")
 
     @property
     def frequency_array(self):
@@ -49,6 +60,10 @@ class WaveformGenerator(object):
             self.__frequency_array_updated = True
         return self.__frequency_array
 
+    @frequency_array.setter
+    def frequency_array(self, frequency_array):
+        self.__frequency_array = frequency_array
+
     @property
     def time_array(self):
         if self.__time_array_updated is False: