diff --git a/.gitignore b/.gitignore
index 510085e..379f855 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,4 @@ Cleopatra/Isotope
 Cleopatra/PlotTGraphTObjArray
 
 __pycache__
+IAEA_NuclearData.csv
\ No newline at end of file
diff --git a/PyGUIQt6/IAEANuclearData.py b/PyGUIQt6/IAEANuclearData.py
index 730aa9b..63427ff 100644
--- a/PyGUIQt6/IAEANuclearData.py
+++ b/PyGUIQt6/IAEANuclearData.py
@@ -10,12 +10,14 @@ mp = 938.27208816 # +- 29
 mn = 939.56542052 # +- 54
 ma = 3727.37915 
 
-class Isotope:
-  def __int__(self):
-
+class IsotopeClass:
+  def __init__(self):
     self.livechart = "https://nds.iaea.org/relnsd/v0/data?"
     self.data = None
 
+    self.DownloadData()
+
+  def DownloadData(self):
     # Read the saved CSV file back into a DataFrame
     try :
       self.data = pd.read_csv('IAEA_NuclearData.csv')
@@ -163,7 +165,7 @@ class Isotope:
     print("        Sa: %9.2f MeV" % self.GetSa(ASym))
     print("=============================")
 
-  def PrintIsoWeb(self, ASym : str):
+  def PrintIsoHTML(self, ASym : str):
     [A, Z] = self.GetAZ(ASym)
     print("<br>========================= ", ASym)
     print("<br>A : %d, Z : %d, N : %d" % (A, Z, A-Z))
diff --git a/PyGUIQt6/PtolemyGUIPy.py b/PyGUIQt6/PtolemyGUIPy.py
index a6aae6a..c52ef41 100755
--- a/PyGUIQt6/PtolemyGUIPy.py
+++ b/PyGUIQt6/PtolemyGUIPy.py
@@ -4,6 +4,7 @@ import os
 import platform
 import subprocess
 import sys
+import time
 from functools import partial
 from PyQt6.QtWidgets import (
   QApplication, QMainWindow, QGridLayout, QPushButton, 
@@ -41,6 +42,7 @@ class PlotWindow(QWidget):
     self.showMarker_checkBox = QCheckBox("Show Markers")
     self.showMarker_checkBox.stateChanged.connect(self.plot_plotly_graph)
 
+    self.html_file = None
     self.web_view = QWebEngineView()
 
     layout = QGridLayout(self)
@@ -83,6 +85,10 @@ class PlotWindow(QWidget):
       # print(self.headers)
 
   def plot_plotly_graph(self):
+
+    if self.html_file and os.path.exists(self.html_file):
+      os.remove(self.html_file)
+    
     # Create a Plotly figure
     fig = go.Figure()
 
@@ -145,13 +151,16 @@ class PlotWindow(QWidget):
     )
 
     # Save the plot as an HTML file in a temporary location
-    with tempfile.NamedTemporaryFile(delete=False, suffix=".html") as tmp_file:
-      fig.write_html(tmp_file.name)
-      html_file = tmp_file.name
-
-    # Load the HTML file in QWebEngineView
+    timestamp = int(time.time() * 1000)  # Unique timestamp in milliseconds
+    html_file = f"/tmp/plotwindow_{timestamp}.html"
+    fig.write_html(html_file)
+    self.html_file = html_file  # Store for cleanup
     self.web_view.setUrl(QUrl.fromLocalFile(html_file))
 
+  def __del__(self):
+    if os.path.exists(self.html_file):
+       os.remove(self.html_file)
+
 ################################################## MainWindow
 class MyWindow(QMainWindow):
   def __init__(self):
@@ -314,20 +323,6 @@ class MyWindow(QMainWindow):
 
   def file_exists(self,file_path):
     return os.path.exists(file_path) and os.path.isfile(file_path)
-  
-  def A_file_changed_after_B_file(self, file_a, file_b):
-    try:
-      modified_time_a = os.path.getmtime(file_a)
-      modified_time_b = os.path.getmtime(file_b)
-
-      # Compare the modification times
-      return modified_time_a > modified_time_b
-    except FileNotFoundError as e:
-      print(f"Error: {e}")
-      return False
-    except Exception as e:
-      print(f"An error occurred: {e}")
-      return False
 
   def CalDWBA(self):
     
@@ -367,10 +362,7 @@ class MyWindow(QMainWindow):
       # self.BashCommand("../Cleopatra/ExtractXSec " + self.DWBAFileName + ".out " +  option)
 
     if self.chkPlot.isChecked() and self.file_exists(self.DWBAFileName + ".Xsec.txt") :
-      if self.A_file_changed_after_B_file(self.DWBAFileName + ".Xsec.txt", self.DWBAFileName + ".out") :
-        self.open_plot_window()
-      else:
-        self.leStatus.setText( self.DWBAFileName + ".Xsec.txt is not newer than " + self.DWBAFileName + ".out")
+      self.open_plot_window()
 
   def open_plot_window(self):
     if self.plot_window is None :
@@ -385,6 +377,7 @@ class MyWindow(QMainWindow):
   def closeEvent(self, event):
     if self.plot_window:
       self.plot_window.close()  # Close the PlotWindow when MainWindow closes
+      self.plot_window.__del__()
     event.accept()  # Accept the event to proceed with closing the main window
 
 
diff --git a/PyGUIQt6/test.py b/PyGUIQt6/test.py
index 82aade1..1e7a4d9 100755
--- a/PyGUIQt6/test.py
+++ b/PyGUIQt6/test.py
@@ -1,7 +1,11 @@
 #!/usr/bin/python3
 
-from IAEANuclearData import Isotope
+from IAEANuclearData import IsotopeClass
 
-iso = Isotope()
+iso = IsotopeClass()
 
-iso.PrintIso('16O')
\ No newline at end of file
+iso.PrintIso('16O')
+
+pd = iso.GetExList('16O', 10)
+
+print(pd)
\ No newline at end of file