diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..56c11195
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,4 @@
+code/poli3.npz filter=lfs diff=lfs merge=lfs -text
+code/nemeth12.npz filter=lfs diff=lfs merge=lfs -text
+code/spd_5000.npz filter=lfs diff=lfs merge=lfs -text
+code/spd_10000.npz filter=lfs diff=lfs merge=lfs -text
diff --git a/code/spd_5000.npz b/code/spd_5000.npz
new file mode 100644
index 00000000..11b44646
--- /dev/null
+++ b/code/spd_5000.npz
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:2aa92da25acfeafeb204ee81e2feafd04b39f3a86fad2765f538ab95e4581d96
+size 200041030