diff --git a/README.md b/README.md
index 3b80f6bd0a8402499a2177c8d8eaa8a99e0583a6..b8d699ebd47c7474d655147d627eff00bc3e95fb 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 
 ## Aufgabe – Reflexe und Gitterebenen
-Laden Sie für diese Aufgabe die Dateien Zinkblende.cif, [Diamant.cif](cif files/Diamant.cif) und Zinkblende_exp.dat herunter.
+Laden Sie für diese Aufgabe die Dateien [Zinkblende.cif](cif files/Zinkblende.cif), [Diamant.cif](cif files/Diamant.cif) und Zinkblende_exp.dat herunter.
 
 - a)     Importieren Sie in Vesta (https://jp-minerals.org/vesta/en/download.html) die Zinkblende Struktur, erweitern sie die Einheitszellen in x,y und z auf 3 Einheiten und simulieren Sie das Beugungsmuster (PXRD) mit der Wellenlänge von Cu Kalpha lambda=1.54059 Ang. Zeichnen Sie zusätzlich zu den ersten 3 Peaks (2 theta = 28.53 ° , 33.06 ° und 47.45 °) im PXRD jeweils 1 zugehörigen Reflex ein indem sie in Vesta zwei Gitterebenen bei n*d und (n+1)*d. Wählen Sie für diese Ebenen zur besseren Darstellung 5 < n < 20. 
 Exportieren sie das Beugungsmuster für d)
diff --git a/cif files/Zninkblende.cif b/cif files/Zninkblende.cif
new file mode 100644
index 0000000000000000000000000000000000000000..52018379a9c2644f85dd9ae2ba13146b89f27fc8
--- /dev/null
+++ b/cif files/Zninkblende.cif	
@@ -0,0 +1,168 @@
+#------------------------------------------------------------------------------
+#$Date: 2017-10-15 03:23:08 +0300 (Sun, 15 Oct 2017) $
+#$Revision: 202022 $
+#$URL: file:///home/coder/svn-repositories/cod/cif/1/10/00/1100043.cif $
+#------------------------------------------------------------------------------
+#
+# This file is available in the Crystallography Open Database (COD),
+# http://www.crystallography.net/
+#
+# All data on this site have been placed in the public domain by the
+# contributors.
+#
+data_1100043
+loop_
+_publ_author_name
+'Jumpertz, E. A.'
+_publ_section_title
+;
+ Electron-density distribution in zinc blende
+;
+_journal_name_full
+;
+ Zeitschrift f\"ur Elektrochemie und angewandte physikalische Chemie
+;
+_journal_page_first              419
+_journal_page_last               425
+_journal_volume                  59
+_journal_year                    1955
+_chemical_formula_sum            'S Zn'
+_chemical_name_mineral           Sphalerite
+_chemical_name_systematic        'Zinc sulfide'
+_space_group_IT_number           216
+_symmetry_cell_setting           cubic
+_symmetry_Int_Tables_number      216
+_symmetry_space_group_name_Hall  'F -4 2 3'
+_symmetry_space_group_name_H-M   'F -4 3 m'
+_cell_angle_alpha                90
+_cell_angle_beta                 90
+_cell_angle_gamma                90
+_cell_formula_units_Z            4
+_cell_length_a                   5.4145(90)
+_cell_length_b                   5.4145(90)
+_cell_length_c                   5.4145(90)
+_cell_volume                     158.7
+_exptl_crystal_density_meas      3.9
+_cod_database_code               1100043
+loop_
+_symmetry_equiv_pos_as_xyz
+x,y,z
+y,z,x
+z,x,y
+x,z,y
+y,x,z
+z,y,x
+x,-y,-z
+y,-z,-x
+z,-x,-y
+x,-z,-y
+y,-x,-z
+z,-y,-x
+-x,y,-z
+-y,z,-x
+-z,x,-y
+-x,z,-y
+-y,x,-z
+-z,y,-x
+-x,-y,z
+-y,-z,x
+-z,-x,y
+-x,-z,y
+-y,-x,z
+-z,-y,x
+x,1/2+y,1/2+z
+1/2+x,y,1/2+z
+1/2+x,1/2+y,z
+y,1/2+z,1/2+x
+1/2+y,z,1/2+x
+1/2+y,1/2+z,x
+z,1/2+x,1/2+y
+1/2+z,x,1/2+y
+1/2+z,1/2+x,y
+x,1/2+z,1/2+y
+1/2+x,z,1/2+y
+1/2+x,1/2+z,y
+y,1/2+x,1/2+z
+1/2+y,x,1/2+z
+1/2+y,1/2+x,z
+z,1/2+y,1/2+x
+1/2+z,y,1/2+x
+1/2+z,1/2+y,x
+x,1/2-y,1/2-z
+1/2+x,-y,1/2-z
+1/2+x,1/2-y,-z
+y,1/2-z,1/2-x
+1/2+y,-z,1/2-x
+1/2+y,1/2-z,-x
+z,1/2-x,1/2-y
+1/2+z,-x,1/2-y
+1/2+z,1/2-x,-y
+x,1/2-z,1/2-y
+1/2+x,-z,1/2-y
+1/2+x,1/2-z,-y
+y,1/2-x,1/2-z
+1/2+y,-x,1/2-z
+1/2+y,1/2-x,-z
+z,1/2-y,1/2-x
+1/2+z,-y,1/2-x
+1/2+z,1/2-y,-x
+-x,1/2+y,1/2-z
+1/2-x,y,1/2-z
+1/2-x,1/2+y,-z
+-y,1/2+z,1/2-x
+1/2-y,z,1/2-x
+1/2-y,1/2+z,-x
+-z,1/2+x,1/2-y
+1/2-z,x,1/2-y
+1/2-z,1/2+x,-y
+-x,1/2+z,1/2-y
+1/2-x,z,1/2-y
+1/2-x,1/2+z,-y
+-y,1/2+x,1/2-z
+1/2-y,x,1/2-z
+1/2-y,1/2+x,-z
+-z,1/2+y,1/2-x
+1/2-z,y,1/2-x
+1/2-z,1/2+y,-x
+-x,1/2-y,1/2+z
+1/2-x,-y,1/2+z
+1/2-x,1/2-y,z
+-y,1/2-z,1/2+x
+1/2-y,-z,1/2+x
+1/2-y,1/2-z,x
+-z,1/2-x,1/2+y
+1/2-z,-x,1/2+y
+1/2-z,1/2-x,y
+-x,1/2-z,1/2+y
+1/2-x,-z,1/2+y
+1/2-x,1/2-z,y
+-y,1/2-x,1/2+z
+1/2-y,-x,1/2+z
+1/2-y,1/2-x,z
+-z,1/2-y,1/2+x
+1/2-z,-y,1/2+x
+1/2-z,1/2-y,x
+loop_
+_atom_site_label
+_atom_site_type_symbol
+_atom_site_symmetry_multiplicity
+_atom_site_Wyckoff_symbol
+_atom_site_fract_x
+_atom_site_fract_y
+_atom_site_fract_z
+_atom_site_occupancy
+_atom_site_attached_hydrogens
+_atom_site_calc_flag
+Zn1 Zn2+ 4 a 0. 0. 0. 1. 0 d
+S1 S2- 4 c 0.25 0.25 0.25 1. 0 d
+loop_
+_atom_type_symbol
+_atom_type_oxidation_number
+Zn2+ 2.000
+S2- -2.000
+loop_
+_cod_related_entry_id
+_cod_related_entry_database
+_cod_related_entry_code
+1 MPOD 1000125
+2 MPOD 1000146