diff --git a/swash/processing/read_swash.py b/swash/processing/read_swash.py
index 2c0936c..4f7a178 100644
--- a/swash/processing/read_swash.py
+++ b/swash/processing/read_swash.py
@@ -16,14 +16,12 @@ class ReadSwash:
 
     @classmethod
     def read_nohead(cls, path):
-        with tempfile.TemporaryFile(mode="w+t") as tmpfile:
-            log.info(f"Replacing \\s with \\n in '{path}'")
-            subprocess.run(("sed", r"s/\s\+/\n/g;/^$/d", path), stdout=tmpfile, text=True)
-            log.info(f"Loading '{path}'")
-            tmpfile.seek(0)
-            a = np.asarray(tmpfile.readlines(), dtype=float)
-            log.debug(f"path={a}")
-            return a
+        data = []
+        with path.open() as inp:
+            for line in inp:
+                data += line.split()
+
+        return np.asarray(data, dtype=float)
 
     def read_time(self, path):
         self._t = np.unique(self.read_nohead(path))
diff --git a/swash/processing/sws_npz.py b/swash/processing/sws_npz.py
index 5b3f74c..3bf6c0c 100644
--- a/swash/processing/sws_npz.py
+++ b/swash/processing/sws_npz.py
@@ -33,20 +33,17 @@ var = {
     #"dep": rsws.read_scalar,
     "botl": rsws.read_const,
     "watl": rsws.read_scalar,
-    "pressk": rsws.read_scalar_lay,
-    "nhprsk": rsws.read_scalar_lay,
-    "zk": rsws.read_scalar_lay,
-    "velk": rsws.read_vector_lay,
-    "vz": rsws.read_scalar_lay,
+    #"pressk": rsws.read_scalar_lay,
+    #"nhprsk": rsws.read_scalar_lay,
+    #"zk": rsws.read_scalar_lay,
+    #"velk": rsws.read_vector_lay,
+    #"vz": rsws.read_scalar_lay,
     "vel": rsws.read_vector,
 }
 
-with ThreadPool(len(var)) as pool:
-    log.info("Converting all data")
-    pool.map(
-        lambda x: np.save(
-            inp.joinpath(x[0]),
-            x[1](sws_out.joinpath(x[0]).with_suffix(".dat")),
-        ),
-        var.items(),
+for name, f in var.items():
+    log.info(f"Converting {name}")
+    np.save(
+        inp.joinpath(name),
+        f(sws_out.joinpath(name).with_suffix(".dat")),
     )