update csv

app.py

@@ -918,7 +918,7 @@ def compute_index_histogram(file_url: str, index_name: str, start_date: str, end
     final_string = ", ".join(output_parts)
 
     # Return the string as a plain text response
-    return Response(content=final_string, media_type="text/plain")
+    return Response(content=final_string, media_type="text/csv")
 
 # Register endpoints for multiple indices with date range
 for idx in ["NDVI", "EVI", "EVI2", "RandomForest", "CI", "GujVDI"]: