--- a/COBRAxy/flux_simulation.py	Thu Oct 09 09:32:41 2025 +0000
+++ b/COBRAxy/flux_simulation.py	Thu Oct 09 10:00:03 2025 +0000
@@ -119,27 +119,34 @@
     
     parser.add_argument('-otm', '--out_mean',
                     type = str,
+                    required=False,
                     help = 'output of mean of fluxes')
     
     parser.add_argument('-otmd', '--out_median',
                     type = str,
+                    required=False,
                     help = 'output of median of fluxes')
 
     parser.add_argument('-otq', '--out_quantiles',
                     type = str,
+                    required=False,
                     help = 'output of quantiles of fluxes')
     
     parser.add_argument('-otf', '--out_fluxes',
                     type = str,
+                    required=False,
                     help = 'output of fluxes')
     parser.add_argument('-otfva', '--out_fva',
                     type = str, 
+                    required=False,
                     help = 'output of FVA results')
     parser.add_argument('-otp', '--out_pfba',
                     type = str,
+                    required=False,
                     help = 'output of pFBA results')
     parser.add_argument('-ots', '--out_sensitivity',
                     type = str,
+                    required=False,
                     help = 'output of sensitivity results')
     ARGS = parser.parse_args(args)
     return ARGS