diff --git a/api/server/volumes/parcellationmap.py b/api/server/volumes/parcellationmap.py
index 4b284a9..78bb8ba 100644
--- a/api/server/volumes/parcellationmap.py
+++ b/api/server/volumes/parcellationmap.py
@@ -84,7 +84,7 @@ def get_parcellation_labelled_map(parcellation_id: str, space_id: str, region_id
 """)
 @version(*FASTAPI_VERSION)
 @router_decorator(ROLE, func=statistical_map_nii_gz)
-def get_region_statistical_map(parcellation_id: str, space_id: str, region_id: str, extra_spec: str="", *, func):
+def get_region_statistical_map(parcellation_id: str, region_id: str, space_id: str, extra_spec: str="", *, func):
     """Get statistical map according to specification"""
     if func is None:
         raise HTTPException(500, f"func: None passsed")
@@ -94,7 +94,7 @@ def get_region_statistical_map(parcellation_id: str, space_id: str, region_id: s
         "content-disposition": f'attachment; filename="statistical_map.nii.gz"'
     }
 
-    full_filename, cache_flag = func(parcellation_id, region_id, space_id, extra_spec)
+    full_filename, cache_flag = func(parcellation_id=parcellation_id, region_id=region_id, space_id=space_id, extra_spec=extra_spec)
     if cache_flag:
         headers[cache_header] = "hit"
     assert os.path.isfile(full_filename), f"file saved incorrectly"
@@ -107,12 +107,12 @@ class StatisticModelInfo(BaseModel):
 @router.get("/statistical_map.info.json", response_model=StatisticModelInfo, tags=TAGS)
 @version(*FASTAPI_VERSION)
 @router_decorator(ROLE, func=statistical_map_info_json)
-def get_region_statistical_map_metadata(parcellation_id: str, space_id: str, region_id: str, extra_spec: str="", *, func):
+def get_region_statistical_map_metadata(parcellation_id: str, region_id: str, space_id: str, extra_spec: str="", *, func):
     """Get metadata of statistical map according to specification"""
     if func is None:
         raise HTTPException(500, f"func: None passsed")
     
-    data = func(parcellation_id, region_id, space_id, extra_spec)
+    data = func(parcellation_id=parcellation_id, region_id=region_id, space_id=space_id, extra_spec=extra_spec)
     return StatisticModelInfo(**data)
 
 @router.get("/assign", response_model=DataFrameModel, tags=TAGS)
diff --git a/new_api/v3/data_handlers/map/__init__.py b/new_api/v3/data_handlers/map/__init__.py
index daa4c33..d8687a5 100644
--- a/new_api/v3/data_handlers/map/__init__.py
+++ b/new_api/v3/data_handlers/map/__init__.py
@@ -56,12 +56,12 @@ def get_map(parcellation_id: str, space_id: str, maptype: Union[MapType, str], e
     return instance_to_model(returned_maps[0], detail=True).dict()
 
 @data_decorator(ROLE)
-def statistical_map_nii_gz(parcellation_id: str, space_id: str, region_id: str, extra_spec: str="", *, no_cache: bool=False):
+def statistical_map_nii_gz(parcellation_id: str, region_id: str, space_id: str, extra_spec: str="", *, no_cache: bool=False):
     filename, return_cached, warningtext = cache_region_statistic_map(parcellation_id, region_id, space_id, extra_spec, no_cache=no_cache)
     return filename, return_cached
 
 @data_decorator(ROLE)
-def statistical_map_info_json(parcellation_id: str, space_id: str, region_id: str, extra_spec: str="", *, no_cache: bool=False):
+def statistical_map_info_json(parcellation_id: str, region_id: str, space_id: str, extra_spec: str="", *, no_cache: bool=False):
     filename, return_cached, warningtext = cache_region_statistic_map(parcellation_id, region_id, space_id, extra_spec, no_cache=no_cache)
 
     import nibabel as nib