diff --git a/bin/stats/pluviometer.py b/bin/stats/pluviometer.py
index 5719a14..3b471df 100644
--- a/bin/stats/pluviometer.py
+++ b/bin/stats/pluviometer.py
@@ -131,7 +131,6 @@ def __init__(self, site_filter: SiteFilter) -> None:
         Row-columns corresponding to the same base (e.g. (0,0) -> (A,A)) do not represent edits, and should remain 0
         """
         self.edit_read_freqs: NDArray[np.int32] = np.zeros((5, 5), dtype=np.int32)
-
         self.edit_site_freqs: NDArray[np.int32] = np.zeros((5, 5), dtype=np.int32)
 
         self.genome_base_freqs: NDArray[np.int32] = np.zeros(5, dtype=np.int32)
diff --git a/bin/stats/site_variant_readers.py b/bin/stats/site_variant_readers.py
index e0ba5ca..896c2a6 100644
--- a/bin/stats/site_variant_readers.py
+++ b/bin/stats/site_variant_readers.py
@@ -33,10 +33,10 @@ def __init__(self, strand: int, edit: str) -> None:
         self.position: int = 0
         self.strand:int = strand
         assert edit in EDIT_TYPES + NONEDIT_TYPES
-        self.reference: int = NUC_STR_TO_IND[edit[0]]
+        self.reference: int = NUC_STR_TO_IND.get(edit[0], 4)
         self.edited: str = edit[1]
         self.frequencies: NDArray[np.int32] = np.zeros(5, dtype=np.int32)
-        self.frequencies[NUC_STR_TO_IND[self.edited]] = 1
+        self.frequencies[NUC_STR_TO_IND.get(self.edited, 4)] = 1
 
         return None
 
@@ -124,7 +124,7 @@ def _parse_parts(self) -> SiteVariantData:
         return SiteVariantData(
             seqid=self.parts[REDITOOLS_FIELD_INDEX["Seqid"]],
             position=int(self.parts[REDITOOLS_FIELD_INDEX["Position"]]) - 1,    # Convert Reditools 1-based index to Python's 0-based index
-            reference=NUC_STR_TO_IND[reference_nuc_str],
+            reference=NUC_STR_TO_IND.get(reference_nuc_str, 4),
             strand=strand,
             coverage=int(self.parts[REDITOOLS_FIELD_INDEX["Coverage"]]),
             mean_quality=float(self.parts[REDITOOLS_FIELD_INDEX["MeanQ"]]),
diff --git a/bin/stats/test_pluviometer.py b/bin/stats/test_pluviometer.py
index 104da72..0e052d0 100644
--- a/bin/stats/test_pluviometer.py
+++ b/bin/stats/test_pluviometer.py
@@ -5,6 +5,8 @@
 from Bio.SeqRecord import SeqRecord
 from site_variant_readers import TestReader
 from pluviometer import RecordManager
+from pluviometer import SiteFilter
+from pluviometer import write_output_file_header
 from contextlib import nullcontext
 from typing import Generator
 from utils import SiteVariantData
@@ -32,6 +34,14 @@ def parse_cli_input() -> argparse.Namespace:
         type=str,
         help="Name of the output file (leave empty to write to stdout)",
     )
+    parser.add_argument(
+        "--aggregation_mode",
+        "-a",
+        type=str,
+        default="all",
+        choices=["all", "cds_longest"],
+        help='Mode for aggregating counts: "all" aggregates features of every transcript; "cds_longest" aggregates features of the longest CDS or non-coding transcript',
+    )
 
     return parser.parse_args()
 
@@ -41,6 +51,10 @@ def parse_cli_input() -> argparse.Namespace:
     with (open(args.gff) as gff_handle,
         open(args.output, "w") if len(args.output) > 0 else nullcontext(sys.stdout) as output_handle):
         records: Generator[SeqRecord, None, None] = GFF.parse(gff_handle)
+
+        global_filter: SiteFilter = SiteFilter(cov_threshold=1, edit_threshold=1)
+
+        write_output_file_header(output_handle)
         
         for record in records:
             sv_reader = TestReader(
@@ -49,5 +63,10 @@ def parse_cli_input() -> argparse.Namespace:
             )
             sv_data: SiteVariantData = sv_reader.read()
 
-            manager: RecordManager = RecordManager(record, output_handle)
+            manager: RecordManager = RecordManager(
+                record,
+                global_filter,
+                output_handle,
+                args.aggregation_mode
+                )
             manager.scan_and_count(sv_reader)