diff --git a/xdas/io/terra15.py b/xdas/io/terra15.py
index 84e5ffc..7c969ac 100644
--- a/xdas/io/terra15.py
+++ b/xdas/io/terra15.py
@@ -7,13 +7,13 @@
 from ..virtual import VirtualSource
 
 
-def read(fname,tz=timezone.utc):
+def read(fname, tz=timezone.utc):
     with h5py.File(fname, "r") as file:
         ti = np.datetime64(
-            datetime.fromtimestamp(file["data_product"]["gps_time"][0],tz=tz)
+            datetime.fromtimestamp(file["data_product"]["gps_time"][0], tz=tz)
         ).astype("datetime64[ms]")
         tf = np.datetime64(
-            datetime.fromtimestamp(file["data_product"]["gps_time"][-1],tz=tz)
+            datetime.fromtimestamp(file["data_product"]["gps_time"][-1], tz=tz)
         ).astype("datetime64[ms]")
         d0 = file.attrs["sensing_range_start"]
         dx = file.attrs["dx"]
@@ -21,4 +21,4 @@ def read(fname,tz=timezone.utc):
     nt, nd = data.shape
     t = {"tie_indices": [0, nt - 1], "tie_values": [ti, tf]}
     d = {"tie_indices": [0, nd - 1], "tie_values": [d0, d0 + (nd - 1) * dx]}
-    return DataArray(data, {"time": t, "distance": d})
\ No newline at end of file
+    return DataArray(data, {"time": t, "distance": d})