diff --git a/nnfwtbn/process.py b/nnfwtbn/process.py
index db5d360378465e544dd886a442e08d2384752c74..535eaed00a0c70b7a5a252df1a3f037c6cb5bcb3 100644
--- a/nnfwtbn/process.py
+++ b/nnfwtbn/process.py
@@ -11,15 +11,13 @@ class Process:
 
     DEFAULT_RANGE_VAR = 'fpid'
 
-    def __init__(self, label, selection=None, type="fill", range=None, 
-                 range_var=None, **kwds):
+    def __init__(self, label, selection=None, range=None, 
+                 range_var=None):
         r"""
         Returns a new process object. The process has a human-readable name
         (potentially using latex) and a selection cut. The selection argument
-        can be a cut object or any callable. The optional argument 'type'
-        defines how the process is displayed in a histogram. Possible values
-        are are 'fill', 'line' and 'points'. Stacking of processes is handled by
-        the plotting method. The default value is 'fill'.
+        can be a cut object or any callable. Stacking of processes is handled by
+        the plotting method.
 
         >>> Process("Top", lambda d: d.is_top)
         <Process 'Top': (func)>
@@ -37,12 +35,6 @@ class Process:
 
         If the range_var argument is omitted, the value of
         Process.DEFAULT_RANGE_VAR is used, this defaults to 'fpid'.
-
-        Any other Keyword argument is passed directly to the matplotlib upon
-        plotting.
-
-        >>> Process("VBF", lambda d: d.is_VBFH, linestyle="--")
-        <Process 'VBF': (func)>
         """
         #######################################################
         # Selection
@@ -77,18 +69,8 @@ class Process:
                                               " can be used.")
 
         #######################################################
-        # Type
-        allowed_types = ["fill", "line", "point"]
-        if not type in allowed_types:
-            raise err.InvalidProcessType("Process type must be one of %s." %
-                                         repr(allowed_types))
-        self.type = type 
-
-        #######################################################
-        # Other
+        # Label
         self.label = label
-        self.type = type
-        self.mpl_kwds = kwds
 
     
     def __repr__(self):
diff --git a/nnfwtbn/tests/test_process.py b/nnfwtbn/tests/test_process.py
index dd55b2204a8948d907b610093b4102939e8e9e1b..96aa2ba8babf03e321ca398fe966b4a88b26d989 100644
--- a/nnfwtbn/tests/test_process.py
+++ b/nnfwtbn/tests/test_process.py
@@ -11,14 +11,25 @@ class ProcessTestCase(unittest.TestCase):
         """
         Check that all arguments are stored internally.
         """
-        process = Process("Top", selection=lambda d: d.is_top,
-                          color='#fe0134', linewidth=2)
+        process = Process("Top", selection=lambda d: d.is_top)
 
         self.assertEqual(process.label, "Top")
         self.assertIsNotNone(process.selection)
-        self.assertEqual(process.type, "fill")
-        self.assertEqual(process.mpl_kwds,
-                         {'color': '#fe0134', 'linewidth': 2})
+
+
+    def test_no_type(self):
+        """
+        Check that processes don't accept the 'type' argument.
+        """
+        self.assertRaises(TypeError, Process, "Top", type="fill",
+                          selection=lambda d: d.is_top)
+
+    def test_no_color(self):
+        """
+        Check that processes don't accept the 'color' argument.
+        """
+        self.assertRaises(TypeError, Process, "Top", color="#ff0000",
+                          selection=lambda d: d.is_top)
 
 
     def test_lambda(self):
@@ -82,23 +93,6 @@ class ProcessTestCase(unittest.TestCase):
         process = Process("Top", range=(5, 10), range_var="yet_another")
         self.assertEqual(process.range_var, "yet_another")
 
-    def test_type_values(self):
-        """
-        Check that allowed type values are stored. Check that an error is
-        raised if an illegal value is passed to the constructor.
-        """
-        process = Process("Top", selection=lambda d: d.is_top, type='fill')
-        self.assertEqual(process.type, 'fill')
-
-        process = Process("Top", selection=lambda d: d.is_top, type='point')
-        self.assertEqual(process.type, 'point')
-
-        process = Process("Top", selection=lambda d: d.is_top, type='line')
-        self.assertEqual(process.type, 'line')
-
-        self.assertRaises(ValueError, Process, "Top", selection=lambda d: d.is_top,
-                          type='other')
-
     def test_range_type(self):
         """
         Check that an exception is raised if the range argument is not a tuple