diff --git a/app.py b/app.py
index e88b087..e7ebaf2 100644
--- a/app.py
+++ b/app.py
@@ -1,6 +1,6 @@
 import sys
 import crds_calc
-from pandas import read_csv
+from pandas import read_csv, DataFrame
 from PyQt5 import QtGui, QtWidgets, QtCore
 from db import mem
 from mainwin import Ui_MainWindow
@@ -11,7 +11,8 @@ from varname.core import nameof
 from hashlib import md5
 from sqlitedict import SqliteDict
 from pprint import PrettyPrinter
-import numpy as np
+from numpy import average as np_average
+from pyperclip import copy as pycopy
 
 class AppWindow(QtWidgets.QMainWindow, Ui_MainWindow):
 
@@ -264,11 +265,11 @@ class AppWindow(QtWidgets.QMainWindow, Ui_MainWindow):
 
             tau_out = ""
             for p_i in range(len(mem['time_constants'][0])):
-                tau_avg = np.average(mem['time_constants'][0:len(mem['time_constants'])][p_i])
+                tau_avg = np_average(mem['time_constants'][0:len(mem['time_constants'])][p_i])
 
                 pp = PrettyPrinter(indent=2)
                 tau_out += f"""
-Tooth: {p_i+1}
+Tooth: {p_i}
 Tau Average: {tau_avg}
                 """
 # NOTE: Insert above inside fstring to see raw data; 
@@ -289,6 +290,16 @@ Tau Average: {tau_avg}
         scene.addItem(item)
         self.equation_view.setScene(scene)
 
+        # Tau output actions
+        self.copy_results_button.pressed.connect(lambda: pycopy(self.tau_output.toPlainText()))
+        def export_csv():
+            try:
+                filename, _ = QtWidgets.QFileDialog.getSaveFileName(self)
+                DataFrame(mem['time_constants']).to_csv(filename, index=False)
+            except KeyError:
+                display_error("No tau data to export.")
+        self.export_csv_button.pressed.connect(export_csv)
+
         # Show self
 
         self.show()
diff --git a/requirements.txt b/requirements.txt
index a7c11b9..59dafba 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,6 +3,7 @@ pandas
 matplotlib
 numpy
 pyinstaller==4.4
+pyperclip
 sqlitedict
 scipy
 varname
diff --git a/ui/mainwin.ui b/ui/mainwin.ui
index d6f4e21..05d9134 100644
--- a/ui/mainwin.ui
+++ b/ui/mainwin.ui
@@ -41,7 +41,7 @@
          <x>0</x>
          <y>0</y>
          <width>267</width>
-         <height>917</height>
+         <height>897</height>
         </rect>
        </property>
        <layout class="QVBoxLayout" name="verticalLayout_2">
@@ -95,13 +95,13 @@
           <property name="minimumSize">
            <size>
             <width>248</width>
-            <height>306</height>
+            <height>286</height>
            </size>
           </property>
           <property name="maximumSize">
            <size>
             <width>248</width>
-            <height>306</height>
+            <height>286</height>
            </size>
           </property>
           <property name="font">
@@ -845,7 +845,7 @@ p, li { white-space: pre-wrap; }
 &lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-size:7.8pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
              </property>
             </widget>
-            <widget class="QPushButton" name="copyResultsButton">
+            <widget class="QPushButton" name="copy_results_button">
              <property name="geometry">
               <rect>
                <x>20</x>
@@ -858,7 +858,7 @@ p, li { white-space: pre-wrap; }
               <string>Copy</string>
              </property>
             </widget>
-            <widget class="QPushButton" name="exportPlaintextButton">
+            <widget class="QPushButton" name="export_csv_button">
              <property name="geometry">
               <rect>
                <x>20</x>
@@ -868,7 +868,7 @@ p, li { white-space: pre-wrap; }
               </rect>
              </property>
              <property name="text">
-              <string>Export Text</string>
+              <string>Export CSV</string>
              </property>
             </widget>
            </widget>
diff --git a/widgets.py b/widgets.py
index 6e51e6c..cc36b2c 100644
--- a/widgets.py
+++ b/widgets.py
@@ -175,7 +175,7 @@ class TimeConstantGraph(BaseGraph):
         data = []
         for g_i in range(len(mem['time_constants'])):
             data.append(mem['time_constants'][g_i][self.peak_index])
-        self.canv.axes.hist(data, bins='auto', alpha=0.8)
+        self.canv.axes.hist(data, bins='auto', edgecolor='black')
 
 class TimeConstantGraphsViewer(QtWidgets.QTabWidget):
     def __init__(self, x):
@@ -187,7 +187,7 @@ class TimeConstantGraphsViewer(QtWidgets.QTabWidget):
         self.clear()
 
         for p_i in range(len(mem['time_constants'][0])):
-            tab_name = str(p_i+1)
+            tab_name = str(p_i)
             tau_graph = TimeConstantGraph(self)
             tau_graph.set_peak_index(p_i)
             self.addTab(tau_graph, tab_name)