diff --git a/backwash/__init__.py b/backwash/__init__.py
index 366701f..0250550 100644
--- a/backwash/__init__.py
+++ b/backwash/__init__.py
@@ -1,4 +1,4 @@
-from .obr import OBRData
+from .obr import OBRData as OBRData
 
 
 __version__ = '0.1'
diff --git a/backwash/obr.py b/backwash/obr.py
index 27725b4..b6fe524 100644
--- a/backwash/obr.py
+++ b/backwash/obr.py
@@ -1,4 +1,4 @@
-from typing import IO, Self
+from typing import IO
 from dataclasses import dataclass
 from pathlib import Path
 import logging
@@ -32,14 +32,14 @@ class OBRData:
         """
         Time delay (x-axis) for `te` and `tm` data
         """
-        tt = numpy.arange(self.tee.size) * self.dt_ns + self.t0half * 2
+        tt = numpy.arange(self.te.size, dtype=numpy.float64) * self.dt_ns + self.t0half * 2
         return tt
 
     @property
     def wl_range_nm(self) -> NDArray[numpy.float64]:
         freq_range = numpy.asarray([
             self.max_freq_GHz - 1 / (2 * self.dt_ns),
-            welf.max_freq_GHz,
+            self.max_freq_GHz,
             ])
         return C0 / freq_range
 
@@ -66,7 +66,7 @@ class OBRData:
         return scale * ham
 
     @staticmethod
-    def read(file: str | IO[bytes] | Path) -> Self:
+    def read(file: str | IO[bytes] | Path) -> 'OBRData':
         def fromfile(*args, **kwargs) -> NDArray:
             if not isinstance(file, str | Path):
                 file.seek(0)
@@ -77,11 +77,12 @@ class OBRData:
             logger.warning(f'Unexpected magic bytes: {magic}')
 
         metadata = fromfile(dtype=numpy.float64, offset=0x0c, count=4)
-        ng = fromfile(dtype=numpy.float64, offset=0x2e, count=1)
-        gain_dB = fromfile(dtype=numpy.int16, offset=0x36, count=1)
+        ng = fromfile(dtype=numpy.float64, offset=0x2e, count=1)[0]
+        gain_dB = fromfile(dtype=numpy.int16, offset=0x36, count=1)[0]
         dates = fromfile(dtype=numpy.int16, offset=0x46, count=2 * 8)
-        t0half = fromfile(dtype=numpy.float64, offset=0x96, count=1)
+        t0half = fromfile(dtype=numpy.float64, offset=0x96, count=1)[0]
         freq_windowed = fromfile(dtype=numpy.int8, offset=0xb6, count=1).any()
+        raw_sweep_rate = fromfile(dtype=numpy.uint8, offset=0xb9, count=2)
         arr = fromfile(dtype=numpy.float64, offset=0x800)
 
         max_freq_GHz = metadata[0]
@@ -101,11 +102,13 @@ class OBRData:
             gain_dB = gain_dB,
             max_freq_GHz = max_freq_GHz,
             ng_setting = ng,
-            freq_windowed = freq_windowed,
+            freq_windowed = bool(freq_windowed),
             meas_date = meas_date,
             calib_date = calib_date,
             _wip_metadata = metadata[1:3],
+            _raw_sweep_rate = raw_sweep_rate,           # TODO translate
             )
+        return result
 
 
 
diff --git a/backwash/ova_bin.py b/backwash/ova_bin.py
index caeae6a..0d653bf 100644
--- a/backwash/ova_bin.py
+++ b/backwash/ova_bin.py
@@ -1,4 +1,4 @@
-from typing import IO, Self
+from typing import IO
 from dataclasses import dataclass
 from pathlib import Path
 import logging
@@ -27,14 +27,14 @@ class OVABINData:
         """
         Time delay (x-axis) for `te` and `tm` data
         """
-        tt = numpy.arange(self.tee.size) * self.dt_ns
+        tt = numpy.arange(self.te.size, dtype=numpy.float64) * self.dt_ns
         return tt
 
     @property
     def wl_range_nm(self) -> NDArray[numpy.float64]:
         freq_range = numpy.asarray([
             self.max_freq_GHz - 1 / (2 * self.dt_ns),
-            welf.max_freq_GHz,
+            self.max_freq_GHz,
             ])
         return C0 / freq_range
 
@@ -61,7 +61,7 @@ class OVABINData:
         return scale * ham
 
     @staticmethod
-    def read(file: str | IO[bytes] | Path) -> Self:
+    def read(file: str | IO[bytes] | Path) -> 'OVABINData':
         raise NotImplementedError('Still WIP')
         def fromfile(*args, **kwargs) -> NDArray:
             if not isinstance(file, str | Path):
@@ -96,6 +96,7 @@ class OVABINData:
             meas_date = meas_date,
             _wip_metadata = metadata[1:],
             )
+        return result
 
 
 """