diff --git a/bin/hdfcoinc/pycbc_page_segtable b/bin/hdfcoinc/pycbc_page_segtable
index ec4c85f642d..7ef37900ccd 100644
--- a/bin/hdfcoinc/pycbc_page_segtable
+++ b/bin/hdfcoinc/pycbc_page_segtable
@@ -31,22 +31,12 @@ from pycbc.events.veto import get_segment_definer_comments
 from pycbc.results import save_fig_with_metadata
 from pycbc.workflow import SegFile
 import pycbc.version
-
-def ifo_combinations(ifo_list, n_ifos):
-    if n_ifos == 0:
-        return [[]]
-    list_combo = []
-    for i in range(0,len(ifo_list)):
-        removed = ifo_list[i]
-        post_removed = ifo_list[i+1:]
-        for subset in ifo_combinations(post_removed, n_ifos-1):
-            list_combo.append([removed] + subset)
-    return list_combo
+import itertools
 
 def powerset_ifos(ifo_set):
     combo_set = []
     for n_ifos in range(1,len(ifo_set)+1):
-        combo_set += ifo_combinations(ifo_set, n_ifos)
+        combo_set += itertools.combinations(ifo_set, n_ifos)
     return combo_set
 
 # parse command line
@@ -63,20 +53,16 @@ parser.add_argument('--title-text', type=str, required=False,
                         help='Additional text to append to title.')
 parser.add_argument('--output-file', type=str,
                         help='Path of the output HTML file.')
-parser.add_argument('--ifos', nargs='+',
-                        help=' List of IFOs.')
+parser.add_argument('--ifos', nargs='+',default=['H1','L1'],
+                        help='(Optional) List of IFOs, default is H1, L1.')
 opts = parser.parse_args()
 
 # setup log
 logging.basicConfig(format='%(asctime)s:%(levelname)s : %(message)s',
                     level=logging.INFO,datefmt='%I:%M:%S')
-if opts.ifos:
-    ifos = opts.ifos
-else:
-    ifos = ['H1', 'L1']
 
 # create list of combinations of detectors
-ifo_combinations = powerset_ifos(ifos)
+ifo_combinations = powerset_ifos(opts.ifos)
 
 # set column names
 columns = (('Name', []),)
@@ -115,7 +101,7 @@ for segment_name in opts.segment_names:
     comp_segs = segments.segmentlistdict({})
 
     # loop over IFOs
-    for ifo in ifos:
+    for ifo in opts.ifos:
 
         # make an empty list for each IFO
         base_segs[ifo] = segments.segmentlist([])
@@ -156,20 +142,12 @@ for segment_name in opts.segment_names:
 
     # set up dictionary of length of time of single-ifo segments in seconds
     ifo_len = {}
-    for ifo in ifos:
+    for ifo in opts.ifos:
         if len(names) > 1:
             ifo_len[ifo] = abs( ( base_segs[ifo].coalesce() & comp_segs[ifo].coalesce() ).coalesce() )
         else:
             ifo_len[ifo] = abs( base_segs[ifo].coalesce() )
 
-    # get length of time of single-IFO segments in seconds
-#    if len(names) > 1:
-#        h1_len = abs( ( base_segs['H1'].coalesce() & comp_segs["H1"].coalesce() ).coalesce() )
-#        l1_len = abs( ( base_segs['L1'].coalesce() & comp_segs["L1"].coalesce() ).coalesce() )
-#    else:
-#        h1_len = abs( base_segs['H1'].coalesce() )
-#        l1_len = abs( base_segs['L1'].coalesce() )
-
     columns[0][1].append(segment_name)
     counter = 1
     for combo in ifo_combinations:
@@ -213,8 +191,6 @@ for segment_name in opts.segment_names:
 #    columns[2][1].append(float(l1_len))
 #    columns[3][1].append(float(h1l1_len))
 
-print(columns)
-
 # cast columns into arrays
 keys = [numpy.array(key, dtype=type(key[0])) for key,_ in columns]
 vals = [numpy.array(val, dtype=type(val[0])) for _,val in columns]