save data as .dat, not .tsv

Author: nschloe

src/tikzplotlib/_line2d.py

@@ -286,7 +286,7 @@ def _table(obj, data):  # noqa: C901
         plot_table.append(f"{x:{xformat}}{col_sep}{y:{ff}}{table_row_sep}")
 
     if data["externalize tables"]:
-        filepath, rel_filepath = _files.new_filepath(data, "table", ".tsv")
+        filepath, rel_filepath = _files.new_filepath(data, "table", ".dat")
         with open(filepath, "w") as f:
             # No encoding handling required: plot_table is only ASCII
             f.write("".join(plot_table))

src/tikzplotlib/_save.py

@@ -72,12 +72,12 @@ def get_tikz_code(
                                       the LaTeX file to the data.
     :type tex_relative_path_to_data: str
 
-    :param externalize_tables: Whether or not to externalize plot data tables into tsv
+    :param externalize_tables: Whether or not to externalize plot data tables into dat
                                files.
     :type externalize_tables: bool
 
     :param override_externals: Whether or not to override existing external files (such
-                               as tsv or images) with conflicting names (the alternative
+                               as dat or images) with conflicting names (the alternative
                                is to choose other names).
     :type override_externals: bool