dags/layers/psd.py: use right data product in median_psd_layer

gstlal/python/dags/layers/psd.py

@@ -57,7 +57,7 @@ def median_psd_layer(config, dag, psd_cache):
 	requirements = {"request_cpus": 2, "request_memory": 2000, **config.condor.submit}
 	layer = Layer("gstlal_median_of_psds", requirements=requirements)
 
-	median_psd_cache = DataCache.generate(DataType.REFERENCE_PSD, config.all_ifos, config.span)
+	median_psd_cache = DataCache.generate(DataType.MEDIAN_PSD, config.all_ifos, config.span)
 
 	layer += Node(
 		inputs = Argument("psds", psd_cache.files),