diff --git a/p9/data/coure/20.dat b/p9/data/coure/20.dat
new file mode 100644
index 0000000..17be94c
--- /dev/null
+++ b/p9/data/coure/20.dat
@@ -0,0 +1,11 @@
+420	0.92	24.287	0.729
+1060	1.13	29.712	0.852
+1230	1.15	30.226	0.864
+1525	1.18	30.997	0.883
+1830	1.25	32.793	0.925
+2220	1.23	32.280	0.913
+2660	1.22	32.024	0.907
+3110	1.23	32.280	0.913
+3460	1.23	32.280	0.913
+3880	1.24	32.537	0.919
+4420	1.25	32.793	0.925