-parser.add_argument("-m", "--margin", type=float, default=4.3, help="print margin in mm (default 4.3)")
-parser.add_argument("-s", "--spine", type=float, default=10, help="on --nup4, mm width of margin hidden in spine (default 10)")
+parser.add_argument("-n", "--nup4", action='store_true', help="puts 4 input pages onto 1 output page")
+parser.add_argument("-a", "--analyze", action="store_true", help="in --nup4, print lines identifying spine, page borders")
+parser.add_argument("-m", "--margin", type=float, default=0.43, help="print margin for --nup4 in cm (default 0.43)")
+parser.add_argument("-s", "--spine", type=float, default=1, help="on --nup4, cm width of margin hidden in spine (default 1)")