Index: fact/tools/pyscripts/pyfact/fir_filter.py
===================================================================
--- fact/tools/pyscripts/pyfact/fir_filter.py	(revision 13026)
+++ fact/tools/pyscripts/pyfact/fir_filter.py	(revision 13027)
@@ -38,4 +38,5 @@
         else:
             filtered= signal.lfilter(self.b, self.a, data)            
+        filtered = filtered.reshape(data.shape)
         return filtered