diff --git a/Dans_Diffraction/classes_properties.py b/Dans_Diffraction/classes_properties.py
index a302968..98a2eab 100644
--- a/Dans_Diffraction/classes_properties.py
+++ b/Dans_Diffraction/classes_properties.py
@@ -575,7 +575,7 @@ def beamline_info(self, energy_kev=None):
         out += ' Formula: {}\n'.format(self.molname())
         out += 'Magnetic: {}\n'.format(self.xtl.Structure.ismagnetic())
         out += '  Weight: %5.2f g/mol\n' % (self.weight())
-        out += ' Density: %5.2f g/cm\n' % (self.density())
+        out += ' Density: %5.2f g/cm^3\n' % (self.density())
         # Symmetry
         out += '\nSymmetry: %r\n' % self.xtl.Symmetry
         # Cell info
@@ -612,7 +612,7 @@ def info(self):
         out += '-----------%s-----------\n'%self.xtl.name
         out += ' Weight: %5.2f g/mol\n' %(self.weight())
         out += ' Volume: %5.2f A^3\n' %(self.volume())
-        out += 'Density: %5.2f g/cm\n' %(self.density())
+        out += 'Density: %5.2f g/cm^3\n' %(self.density())
         out += '\nAtoms:\n'
         types = np.unique(self.xtl.Structure.type)
         props = fc.atom_properties(types) # returns a numpy structured array
diff --git a/Dans_Diffraction/tkgui/crystal.py b/Dans_Diffraction/tkgui/crystal.py
index 0210e06..64eaa73 100644
--- a/Dans_Diffraction/tkgui/crystal.py
+++ b/Dans_Diffraction/tkgui/crystal.py
@@ -75,6 +75,7 @@ def __init__(self, xtl=None):
             'Element Info': {
                 'Element Info': self.menu_info_elements,
                 'Periodic Table': self.menu_info_table,
+                'X-Ray Interactions': self.menu_xray_interactions,
             },
             'Help': {
                 'Help': popup_help,
@@ -245,6 +246,11 @@ def menu_info_table(self):
         """Open periodic table"""
         PeriodTableGui()
 
+    def menu_xray_interactions(self):
+        """Open x-ray interactions gui"""
+        from .properties import XrayInteractionsGui
+        XrayInteractionsGui(self.xtl)
+
     def menu_examples(self):
         """List example files, open in system viewer"""
         import subprocess, platform, ast