diff --git a/.gitignore b/.gitignore
index d1502f5..5b9c50c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ devenv.local.nix
 .pre-commit-config.yaml
 
 data
+__pycache__
diff --git a/figures/non_steady.pdf b/figures/non_steady.pdf
new file mode 100644
index 0000000..4d61518
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diff --git a/figures/non_steady.png b/figures/non_steady.png
new file mode 100644
index 0000000..69bcd94
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diff --git a/fitting_ringdown.org b/fitting_ringdown.org
index a986624..13644f0 100644
--- a/fitting_ringdown.org
+++ b/fitting_ringdown.org
@@ -2,3 +2,9 @@
 :ID:       d7630955-6ca9-4de7-9770-2d50d4847bcd
 :END:
 #+title: Fitting Ringdown
+
+* Failure of the steady state
+
+On the right peak on can see that there might be something fish going
+on. This is ~data/24_05_24/nice_transient2~.
+[[file:figures/non_steady.png]]
diff --git a/ringfit/__pycache__/__init__.cpython-311.pyc b/ringfit/__pycache__/__init__.cpython-311.pyc
deleted file mode 100644
index 77a5638..0000000
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diff --git a/ringfit/__pycache__/data.cpython-311.pyc b/ringfit/__pycache__/data.cpython-311.pyc
deleted file mode 100644
index 3f23ec7..0000000
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diff --git a/ringfit/__pycache__/plotting.cpython-311.pyc b/ringfit/__pycache__/plotting.cpython-311.pyc
deleted file mode 100644
index acbd614..0000000
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diff --git a/ringfit/__pycache__/utils.cpython-311.pyc b/ringfit/__pycache__/utils.cpython-311.pyc
deleted file mode 100644
index de9aad7..0000000
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diff --git a/ringfit/data.py b/ringfit/data.py
index 655610c..2b5d435 100644
--- a/ringfit/data.py
+++ b/ringfit/data.py
@@ -9,7 +9,14 @@ from . import utils
 
 
 class ScanData:
-    def __init__(self, laser: np.ndarray, output: np.ndarray, time: np.ndarray):
+    def __init__(
+        self,
+        laser: np.ndarray,
+        output: np.ndarray,
+        time: np.ndarray,
+        truncation: [float, float] = [0, 100],
+        sparcity: float = 1,
+    ):
         """
         A class to hold the data from an oscilloscope scan where the
         laser frequency is stepped as per the modulation ``laser``.
@@ -19,11 +26,40 @@ class ScanData:
         :param laser: The laser modulation signal.
         :param output: The output intensity signal.
         :param time: The time axis for the signals.
+        :param truncation: The fraction of the signals to truncate
+            from the beginning and end.
+        :param sparcity: The fraction of the signals to keep.
         """
 
-        self._laser = laser
-        self._output = output
-        self._time = time
+        if len(laser) != len(output) or len(laser) != len(time):
+            raise ValueError("The signals must all be the same length.")
+
+        length = len(laser)
+        begin = int(truncation[0] * length / 100)
+        end = int(truncation[1] * length / 100)
+
+        every = int(1 / sparcity)
+
+        self._laser = laser[begin:end:every]
+        self._output = output[begin:end:every]
+        self._time = time[begin:end:every]
+
+    @classmethod
+    def from_dir(cls, directory: str | Path, **kwargs):
+        """Load and parse the oscilloscope data from the
+        ``directory``.  The ``**kwargs`` are passed to the
+        constructor.
+
+        The directory should contain ``signal_laser.npy``,
+        ``signal_outp.npy``, and ``time.npy``.
+        """
+
+        directory = Path(directory)
+        laser = np.load(directory / "signal_laser.npy")
+        output = np.load(directory / "signal_outp.npy")
+        time = np.load(directory / "time.npy")
+
+        return cls(laser, output, time, **kwargs)
 
     @property
     def laser(self):
@@ -81,17 +117,3 @@ class ScanData:
         window = int(step_size * end_fraction)
 
         return np.array([self._output[step - window : step].mean() for step in steps])
-
-
-def load_scan(directory: str | Path):
-    """Load and parse the oscilloscope data from the ``directory``.
-
-    The directory should contain ``signal_laser.npy``, ``signal_outp.npy``, and ``time.npy``.
-    """
-
-    directory = Path(directory)
-    laser = np.load(directory / "signal_laser.npy")
-    output = np.load(directory / "signal_outp.npy")
-    time = np.load(directory / "time.npy")
-
-    return ScanData(laser, output, time)
diff --git a/ringfit/plotting.py b/ringfit/plotting.py
index a093ae5..2ae3ec4 100644
--- a/ringfit/plotting.py
+++ b/ringfit/plotting.py
@@ -1,7 +1,7 @@
 from . import data
 import matplotlib.pyplot as plt
 from scipy.ndimage import uniform_filter1d
-from scipy.interpolate import make_interp_spline, BSpline
+from scipy.interpolate import make_interp_spline
 import numpy as np
 
 
diff --git a/scripts/first_test.py b/scripts/first_test.py
index 354c563..58db471 100644
--- a/scripts/first_test.py
+++ b/scripts/first_test.py
@@ -6,7 +6,11 @@ import matplotlib.pyplot as plt
 from ringfit.data import *
 from ringfit.plotting import *
 
-path = "/home/hiro/Documents/org/roam/code/fitting_ringdown/data/24_05_24/characterization_first"
-scan = data.load_scan(path)
+path = (
+    "/home/hiro/Documents/org/roam/code/fitting_ringdown/data/24_05_24/nice_transient_2"
+)
+scan = ScanData.from_dir(path, truncation=[0, 50])
 
-plot_scan(scan, steps=True)
+fig, ax = plot_scan(scan, steps=True, smoothe_output=1000)
+
+plt.savefig("../figures/non_steady.png")