diff --git a/sidpy/sid/dataset.py b/sidpy/sid/dataset.py
index 58cc6bf2..2ce7743c 100644
--- a/sidpy/sid/dataset.py
+++ b/sidpy/sid/dataset.py
@@ -651,7 +651,7 @@ def plot(self, verbose=False, figure=None, **kwargs):
                 raise NotImplementedError('Datasets with data_type {} cannot be plotted, yet.'.format(self.data_type))
         elif len(self.shape) == 3:
             if verbose:
-                print('3D dataset')
+                print('3D dataset:', self.data_type)
             if self.data_type == DataType.IMAGE:
                 self.view = ImageVisualizer(self, figure=figure, **kwargs)
             elif self.data_type == DataType.IMAGE_MAP:
@@ -663,6 +663,12 @@ def plot(self, verbose=False, figure=None, **kwargs):
                     self.view = ComplexSpectralImageVisualizer(self, figure=figure, **kwargs)
                 else:
                     self.view = SpectralImageVisualizer(self, figure=figure, **kwargs)
+            elif self.data_type.name == 'SPECTRAL_IMAGE':
+                print('spec3')
+                if 'complex' in self.dtype.name:
+                    self.view = ComplexSpectralImageVisualizer(self, figure=figure, **kwargs)
+                else:
+                    self.view = SpectralImageVisualizer(self, figure=figure, **kwargs)
             elif self.data_type == DataType.POINT_CLOUD:
                 self.view = PointCloudVisualizer(self, figure=figure, **kwargs)
             else:
diff --git a/sidpy/viz/dataset_viz.py b/sidpy/viz/dataset_viz.py
index e53d46be..506aff55 100644
--- a/sidpy/viz/dataset_viz.py
+++ b/sidpy/viz/dataset_viz.py
@@ -957,10 +957,6 @@ def __init__(self, dset, figure=None, horizontal=True, **kwargs):
 
         self.button.observe(self._pw_uw, 'value') #pixel or unit wise
 
-        widg = ipywidgets.HBox([self.button])
-        #widg
-        display(widg)
-
     def _pw_uw(self, event):
         pw_uw = event.new
         self.update_image(pw_uw)
diff --git a/tests/sid/test_dataset.py b/tests/sid/test_dataset.py
index f1bf0ece..3bd73b62 100644
--- a/tests/sid/test_dataset.py
+++ b/tests/sid/test_dataset.py
@@ -6,7 +6,6 @@
 """
 from __future__ import division, print_function, unicode_literals, \
     absolute_import
-from os import name
 import unittest
 
 import numpy as np
@@ -14,11 +13,11 @@
 import string
 import ase.build
 import sys
-from copy import copy, deepcopy
+from copy import deepcopy
 
 sys.path.insert(0, "../../sidpy/")
 
-from sidpy.sid.dimension import Dimension, DimensionType
+from sidpy.sid.dimension import Dimension
 from sidpy.sid.dataset import DataType, Dataset
 
 if sys.version_info.major == 3:
@@ -176,7 +175,6 @@ def test_dset_with_variance(self):
         validate_dataset_properties(self, descriptor, values, variance=variance)
 
 
-
 class TestDatasetConstructor(unittest.TestCase):
 
     def test_minimal_inputs(self):
@@ -428,13 +426,14 @@ def test_changing_size(self):
 
     def test_variance(self):
         values = np.ones([4, 5])
-        var = np.random.normal(size=(4,5))
+        var = np.random.normal(size=(4, 5))
         source_dset = Dataset.from_array(values, variance=var)
         descriptor = source_dset.like_data(values)
         self.assertEqual(descriptor.variance, None)
         descriptor = source_dset.like_data(values, variance=var)
         self.assertEqual(descriptor.variance.all(), source_dset.variance.all())
 
+
 class TestCopy(unittest.TestCase):
 
     def test_minimal_inputs(self):
@@ -701,7 +700,7 @@ def test_any_keepdims_multiple_axes(self):
         keepdims_multiple_axes_test(self, 'any', title_prefix='any_aggregate_')
 
 
-class Testminmethod(unittest.TestCase):
+class TestMinMethod(unittest.TestCase):
     def test_min_single_axis(self):
         single_axis_test(self, 'min', title_prefix='min_aggregate_')
 
@@ -715,7 +714,7 @@ def test_min_keepdims_multiple_axes(self):
         keepdims_multiple_axes_test(self, 'min', title_prefix='min_aggregate_')
 
 
-class Testmaxmethod(unittest.TestCase):
+class TestMaxMethod(unittest.TestCase):
     def test_max_single_axis(self):
         single_axis_test(self, 'max', title_prefix='max_aggregate_')
 
@@ -729,7 +728,7 @@ def test_min_keepdims_multiple_axes(self):
         keepdims_multiple_axes_test(self, 'max', title_prefix='max_aggregate_')
 
 
-class Testsummethod(unittest.TestCase):
+class TestSumMethod(unittest.TestCase):
     def test_sum_single_axis(self):
         single_axis_test(self, 'sum', title_prefix='sum_aggregate_')
 
@@ -747,7 +746,7 @@ def test_sum_dtype(self):
         pass
 
 
-class Testmeanmethod(unittest.TestCase):
+class TestMeanMethod(unittest.TestCase):
     def test_mean_single_axis(self):
         single_axis_test(self, 'mean', title_prefix='mean_aggregate_')