diff --git a/README.md b/README.md
index c225d5c..ae980da 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ ax.legend()
 ### Handling Local Sidereal Time
 
 Using the `in_lst()` method of the output DataFrame, you can convert its time index to the local sidereal time (LST).
-Here is a example script that shows JST on the bottom axis and LST on the top axis:
+Here is an example that shows JST on the bottom axis and LST on the top axis:
 
 ```python
 import azely
@@ -126,11 +126,11 @@ ax_jst.set_ylabel('Elevation (deg)')
 ax_jst.set_ylim(0, 90)
 ax_jst.grid(which='both')
 ax_jst.legend()
+ax_jst.margins(0)
 
 # plot invisible elevation for the LST axis
 df.in_lst().el.plot(ax=ax_lst, alpha=0)
 ax_lst.xaxis.set_major_formatter(DateFormatter('%H:%M'))
-ax_jst.margins(0)
 ax_lst.margins(0)
 ```
 
diff --git a/azely/api.py b/azely/api.py
index 9e70382..6d26fcd 100644
--- a/azely/api.py
+++ b/azely/api.py
@@ -164,9 +164,9 @@ def calc(
         source = {"location": source, "object": source, "time": source}
 
     if isinstance(location, dict):
-        location_ = Location(**location)
+        location = Location(**location)
     elif isinstance(location, str):
-        location_ = get_location(
+        location = get_location(
             location,
             google_api=google_api,
             ipinfo_api=ipinfo_api,
@@ -178,9 +178,9 @@ def calc(
         )
 
     if isinstance(object, dict):
-        object_ = Object(**object)
+        object = Object(**object)
     elif isinstance(object, str):
-        object_ = get_object(
+        object = get_object(
             object,
             sep=sep,
             timeout=timeout,
@@ -190,32 +190,32 @@ def calc(
         )
 
     if isinstance(time, dict):
-        time_ = Time(**time)
+        time = Time(**time)
     elif isinstance(time, str):
-        time_ = get_time(
+        time = get_time(
             time,
             sep=sep,
             append=append.get("time", True),
             overwrite=overwrite.get("time", False),
             source=source.get("time", AZELY_CACHE),
         )
-    time_ = replace(time_, timezone=str(location_.timezone))
+    time = replace(time, timezone=str(location.timezone))
 
-    skycoord = object_.skycoord(
+    skycoord = object.skycoord(
         ObsTime(
-            time_.index.tz_convert(None),
-            location=location_.earthlocation,
+            time.index.tz_convert(None),
+            location=location.earthlocation,
         )
     ).altaz
 
     azel = AzEl(
-        index=time_.index,
+        index=time.index,
         data={
             "az": skycoord.az,  # type: ignore
             "el": skycoord.alt,  # type: ignore
         },
     )
-    azel.location = location_
-    azel.object = object_
-    azel.time = time_
+    azel.location = location
+    azel.object = object
+    azel.time = time
     return azel
diff --git a/docs/_static/lst-axis.svg b/docs/_static/lst-axis.svg
index 6b4c8a5..98efb6e 100644
--- a/docs/_static/lst-axis.svg
+++ b/docs/_static/lst-axis.svg
@@ -6,7 +6,7 @@
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-    <dc:date>2025-07-06T16:03:59.086079</dc:date>
+    <dc:date>2025-07-07T01:13:33.683598</dc:date>
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      </g>
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diff --git a/docs/_static/one-liner.svg b/docs/_static/one-liner.svg
index d75654a..abf2c26 100644
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diff --git a/docs/plot.py b/docs/plot.py
index 2b9a7d1..4cf2546 100644
--- a/docs/plot.py
+++ b/docs/plot.py
@@ -8,7 +8,7 @@ def plot_one_liner() -> None:
     """Plot an example of one-liner."""
     fig, ax = plt.subplots(figsize=(12, 4))
 
-    azely.calc("Sun", "Tokyo", "2025-07-07").el.plot(
+    azely.calc("Sun", "Tokyo", "2025-07-07", source=None).el.plot(
         ylabel="Elevation (deg)",
         ylim=(0, 90),
         grid=True,
@@ -23,7 +23,7 @@ def plot_multiple_objects() -> None:
     fig, ax = plt.subplots(figsize=(12, 4))
 
     for obj in ("Sun", "Sgr A*", "M87", "M104", "Cen A"):
-        df = azely.calc(obj, "ALMA AOS", "2017 April 11 UTC")
+        df = azely.calc(obj, "ALMA AOS", "2017 April 11 UTC", source=None)
         df.el.plot(ax=ax, label=df.object.name)
 
     ax.set_title(f"Location: {df.location.name}")
@@ -42,7 +42,7 @@ def plot_lst_axis() -> None:
     ax_lst = ax_jst.twiny()
 
     for obj in ("M78", "M87"):
-        df = azely.calc(obj, "Tokyo", "2025-07-07")
+        df = azely.calc(obj, "Tokyo", "2025-07-07", source=None)
         df.el.plot(ax=ax_jst, label=df.object.name)
 
     ax_jst.set_title(f"Location: {df.location.name}")
@@ -50,11 +50,11 @@ def plot_lst_axis() -> None:
     ax_jst.set_ylim(0, 90)
     ax_jst.grid(which="both")
     ax_jst.legend()
+    ax_jst.margins(0)
 
     # plot invisible elevation for the LST axis
     df.in_lst().el.plot(ax=ax_lst, alpha=0)
     ax_lst.xaxis.set_major_formatter(DateFormatter("%H:%M"))
-    ax_jst.margins(0)
     ax_lst.margins(0)
 
     fig.tight_layout()