diff --git a/python/corsika/io/library.py b/python/corsika/io/library.py
index 22208f792d5ef0f024e0bd19c9d325d31fa96596..1db756baf5628e6cbcb5eaa32cd2ccd467689ef8 100644
--- a/python/corsika/io/library.py
+++ b/python/corsika/io/library.py
@@ -179,9 +179,6 @@ class Library(object):
             # type from the proccesses subdirectory
             try:
 
-                # create the name of the module containing this output class
-                # module_name = re.sub(r"(?<!^)(?=[A-Z])", "_", out_type).lower()
-
                 # instantiate the output and store it in our dict
                 component = getattr(outputs, out_type)(op.join(path, subdir))
 
diff --git a/python/corsika/io/outputs/observation_plane.py b/python/corsika/io/outputs/observation_plane.py
index 00ac90dd43b0daf6c27f379da1d1eccb609e7a11..bd18edc8ed89b20f5b68faac1a87370775bfb9b1 100644
--- a/python/corsika/io/outputs/observation_plane.py
+++ b/python/corsika/io/outputs/observation_plane.py
@@ -55,7 +55,7 @@ class ObservationPlane(Output):
         """
         return self.__data is not None and self.__config is not None
 
-    def astype(self, dtype: str = "parquet", **kwargs: Any) -> Any:
+    def astype(self, dtype: str = "pandas", **kwargs: Any) -> Any:
         """
         Load the particle data from this observation plane.
 
@@ -71,7 +71,7 @@ class ObservationPlane(Output):
         Any:
             The return type of this method is determined by `dtype`.
         """
-        if dtype == "parquet":
+        if dtype == "arrow":
             return self.__data
         elif dtype == "pandas":
             return self.__data.to_pandas()
@@ -79,7 +79,7 @@ class ObservationPlane(Output):
             raise ValueError(
                 (
                     f"Unknown format '{dtype}' for ObservationPlane. "
-                    "We currently only support ['parquet', 'pandas']."
+                    "We currently only support ['arrow', 'pandas']."
                 )
             )
 
@@ -97,3 +97,9 @@ class ObservationPlane(Output):
             The configuration file for this output.
         """
         return self.__config
+
+    def __repr__(self) -> str:
+        """
+        Return a string representation of this class.
+        """
+        return f"ObservationPlane('{self.config['name']}')"