diff --git a/CITATION.cff b/CITATION.cff
index b9f110b..402cdd3 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -1,9 +1,9 @@
 cff-version: 1.2.0
 message: "If you use this software, please cite it as below."
 
-title: "decode"
+title: "de:code"
 abstract: "DESHIMA code for data analysis"
-version: 2.2.0
+version: 2.3.0
 date-released: 2023-10-25
 license: "MIT"
 doi: "10.5281/zenodo.3384216"
diff --git a/README.md b/README.md
index 8790170..9e4db2c 100644
--- a/README.md
+++ b/README.md
@@ -11,5 +11,5 @@ DESHIMA code for data analysis
 ## Installation
 
 ```shell
-pip install decode==2.2.0
+pip install decode==2.3.0
 ```
diff --git a/decode/__init__.py b/decode/__init__.py
index 0047b4a..9f5227c 100644
--- a/decode/__init__.py
+++ b/decode/__init__.py
@@ -5,7 +5,7 @@
     "plot",
     "select",
 ]
-__version__ = "2.2.0"
+__version__ = "2.3.0"
 
 
 # submodules
diff --git a/decode/plot.py b/decode/plot.py
index decdee9..80c9e2d 100644
--- a/decode/plot.py
+++ b/decode/plot.py
@@ -14,18 +14,18 @@
 DEMS_DIMS = "time", "chan"
 
 
-def state(
-    dems: xr.DataArray,
+def data(
+    data: xr.DataArray,
     /,
     *,
-    on: Literal["time", "sky"] = "time",
+    squeeze: bool = True,
     **options: Any,
 ) -> Artist:
-    """Plot the state coordinate of DEMS.
+    """Plot 1D or 2D data of DEMS or its coordinate.
 
     Args:
-        dems: DEMS DataArray to be plotted.
-        on: On which plane the state coordinate is plotted.
+        data: DEMS DataArray or coordinate DataArray.
+        squeeze: Whether to squeeze the data before plotting.
 
     Keyword Args:
         options: Plotting options to be passed to Matplotlib.
@@ -34,41 +34,47 @@ def state(
         Matplotlib artist object of the plotted data.
 
     """
-    if on == "time":
+    if squeeze:
+        data = data.squeeze()
+
+    if data.dims == (DEMS_DIMS[0],):
         options = {
             "edgecolors": "none",
             "hue": "state",
             "s": 3,
-            "x": "time",
+            "x": DEMS_DIMS[0],
             **options,
         }
-        return dems.state.sortby("state").plot.scatter(**options)
+        return data.plot.scatter(**options)  # type: ignore
 
-    if on == "sky":
+    if data.dims == (DEMS_DIMS[1],):
         options = {
             "edgecolors": "none",
             "hue": "state",
             "s": 3,
-            "x": "lon",
+            "x": DEMS_DIMS[1],
             **options,
         }
-        return dems.lat.plot.scatter(**options)
+        return data.plot.scatter(**options)  # type: ignore
 
-    raise ValueError("On must be either time or sky.")
+    if data.dims == DEMS_DIMS:
+        return data.plot.pcolormesh(**options)  # type: ignore
 
+    raise ValueError(f"Dimensions must be subset of {DEMS_DIMS}.")
 
-def data(
-    data: xr.DataArray,
+
+def state(
+    dems: xr.DataArray,
     /,
     *,
-    squeeze: bool = True,
+    on: Literal["time", "sky"] = "time",
     **options: Any,
 ) -> Artist:
-    """Plot 1D or 2D data of DEMS or its coordinate.
+    """Plot the state coordinate of DEMS.
 
     Args:
-        data: DEMS DataArray or coordinate DataArray.
-        squeeze: Whether to squeeze the data before plotting.
+        dems: DEMS DataArray to be plotted.
+        on: On which plane the state coordinate is plotted.
 
     Keyword Args:
         options: Plotting options to be passed to Matplotlib.
@@ -77,30 +83,24 @@ def data(
         Matplotlib artist object of the plotted data.
 
     """
-    if squeeze:
-        data = data.squeeze()
-
-    if data.dims == (DEMS_DIMS[0],):
+    if on == "time":
         options = {
             "edgecolors": "none",
             "hue": "state",
             "s": 3,
-            "x": DEMS_DIMS[0],
+            "x": "time",
             **options,
         }
-        return data.plot.scatter(**options)  # type: ignore
+        return dems.state.sortby("state").plot.scatter(**options)
 
-    if data.dims == (DEMS_DIMS[1],):
+    if on == "sky":
         options = {
             "edgecolors": "none",
             "hue": "state",
             "s": 3,
-            "x": DEMS_DIMS[1],
+            "x": "lon",
             **options,
         }
-        return data.plot.scatter(**options)  # type: ignore
-
-    if data.dims == DEMS_DIMS:
-        return data.plot.pcolormesh(**options)  # type: ignore
+        return dems.lat.plot.scatter(**options)
 
-    raise ValueError(f"Dimensions must be subset of {DEMS_DIMS}.")
+    raise ValueError("On must be either time or sky.")
diff --git a/pyproject.toml b/pyproject.toml
index 44d547b..456561e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "decode"
-version = "2.2.0"
+version = "2.3.0"
 description = "DESHIMA code for data analysis"
 authors = ["Akio Taniguchi <taniguchi@a.phys.nagoya-u.ac.jp>"]
 keywords = [