From 25d5ba02816eb36427095d706afc92e50baaf474 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Alexandre=20C=C3=B4t=C3=A9?= <marc.cote.19@gmail.com>
Date: Mon, 3 Jul 2017 18:29:08 -0400
Subject: [PATCH 1/2] BF: always save data in <f4

---
 nibabel/streamlines/tck.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nibabel/streamlines/tck.py b/nibabel/streamlines/tck.py
index ad2818d380..cdd0b40f22 100644
--- a/nibabel/streamlines/tck.py
+++ b/nibabel/streamlines/tck.py
@@ -220,9 +220,9 @@ def save(self, fileobj):
             tractogram = self.tractogram.to_world(lazy=True)
 
             for t in tractogram:
-                s = t.streamline.astype(dtype)
+                s = t.streamline
                 data = np.r_[s, self.FIBER_DELIMITER]
-                f.write(data.tostring())
+                f.write(data.astype(dtype).tostring())
                 nb_streamlines += 1
 
             header[Field.NB_STREAMLINES] = nb_streamlines

From c8b34797e6c08e310cb4b2155d820c3265186584 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc-Alexandre=20C=C3=B4t=C3=A9?= <marc.cote.19@gmail.com>
Date: Tue, 4 Jul 2017 19:48:30 -0400
Subject: [PATCH 2/2] RF: save a line :P

---
 nibabel/streamlines/tck.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/nibabel/streamlines/tck.py b/nibabel/streamlines/tck.py
index cdd0b40f22..3b50949005 100644
--- a/nibabel/streamlines/tck.py
+++ b/nibabel/streamlines/tck.py
@@ -220,8 +220,7 @@ def save(self, fileobj):
             tractogram = self.tractogram.to_world(lazy=True)
 
             for t in tractogram:
-                s = t.streamline
-                data = np.r_[s, self.FIBER_DELIMITER]
+                data = np.r_[t.streamline, self.FIBER_DELIMITER]
                 f.write(data.astype(dtype).tostring())
                 nb_streamlines += 1