diff --git a/src/icesat2_tracks/ICEsat2_SI_tools/sliderule_converter_tools.py b/src/icesat2_tracks/ICEsat2_SI_tools/sliderule_converter_tools.py
index 8734f24..eac1e2a 100644
--- a/src/icesat2_tracks/ICEsat2_SI_tools/sliderule_converter_tools.py
+++ b/src/icesat2_tracks/ICEsat2_SI_tools/sliderule_converter_tools.py
@@ -380,11 +380,11 @@ def check_RGT_in_domain(Gtrack_lowest, gdf):
     interect_list = list(result)
     interect_list.sort()
 
-    _logger.debug("RGT in domain: ", len(Gtrack_lowest["RGT"].unique()))
-    _logger.debug("RGT with data found: ", len(gdf_list))
-    _logger.debug("RGT in both: ", len(interect_list))
+    _logger.debug("RGT in domain: %s", len(Gtrack_lowest["RGT"].unique()))
+    _logger.debug("RGT with data found: %s", len(gdf_list))
+    _logger.debug("RGT in both: %s", len(interect_list))
     if len(interect_list) != len(gdf_list):
-        _logger.debug("RGT not in both: ", list(set(gdf_list) - result))
+        _logger.debug("RGT not in both: %s", list(set(gdf_list) - result))
     return interect_list