diff --git a/ex-1/pdf-plot.py b/ex-1/pdf-plot.py
index 07209c3..4b8c6b9 100755
--- a/ex-1/pdf-plot.py
+++ b/ex-1/pdf-plot.py
@@ -9,41 +9,11 @@ plt.figure()
 # plt.figure(figsize=(5, 3))
 # plt.rcParams['font.size'] = 8
 
-# useful coordinates
-y_min = -0.0086     # y min axes
-y_max = 0.1895      # y max axes
-me = -0.22          # mode
-f_me = 0.1806       # f(mode)
-h_f_me = f_me/2     # falf f(mode)
-x_m = -1.5867       # x₋
-x_p = 2.4330        # x₊
-
-# prepare plot
+# draw the function
 x, y = np.loadtxt(sys.stdin, unpack=True)
 plt.title('Landau distribution', loc='right')
-plt.xlim(-10, 10)
-plt.ylim(y_min, y_max)
-
-# draw the lines
-plt.plot([-10, me],  [f_me, f_me],     color='gray')
-plt.plot([me, me],  [f_me, y_min],     color='gray')
-plt.plot([-10, x_p], [h_f_me, h_f_me], color='gray')
-plt.plot([x_m, x_m], [y_min, h_f_me],  color='gray')
-plt.plot([x_p, x_p], [y_min, h_f_me],  color='gray')
-
-# draw the function
 plt.plot(x, y, color='#92182b')
 
-# draw the notes
-s = 0.012
-S = 0.2
-plt.annotate('$f(m_e)$',   [-10 + S, f_me - s])
-plt.annotate('$f(m_e)/2$', [-10 + S, h_f_me - s])
-plt.annotate('$x_-$',      [x_m + S, y_min + s/2])
-plt.annotate('$x_+$',      [x_p + S, y_min + s/2])
-plt.annotate('$m_e$',      [me + S, y_min + s/2])
-
-
 plt.tight_layout()
 plt.show()
-# plt.savefig('notes/images/1-notes.pdf')
+# plt.savefig('notes/images/1-landau.pdf')