diff --git a/lorawan_toa.py b/lorawan_toa.py
index 16e530b..4b917fa 100644
--- a/lorawan_toa.py
+++ b/lorawan_toa.py
@@ -54,7 +54,7 @@ def get_toa(n_size, n_sf, n_bw=125, enable_auto_ldro=True, enable_ldro=False,
         t_sym: the time on air in millisecond*.
         t_preamble:
         v_ceil:
-        n_payload:
+        symbol_size_payload:
         t_payload:
         t_packet: the time on air in *milisecond*.
     '''
@@ -91,7 +91,7 @@ def get_toa(n_size, n_sf, n_bw=125, enable_auto_ldro=True, enable_ldro=False,
     ret["t_preamble"] = t_preamble
     ret["v_DE"] = v_DE
     ret["v_ceil"] = v_ceil
-    ret["n_payload"] = n_payload
+    ret["n_sym_payload"] = n_payload
     ret["t_payload"] = t_payload
     ret["t_packet"] = round(t_packet, 3)
 
@@ -129,7 +129,7 @@ if __name__ == "__main__" :
         p.add_argument("--preamble", action="store", dest="n_preamble",
             type=int, default=8, metavar="NUMBER",
             help="specify the preamble. default is 8 for AS923.")
-        p.add_argument("--duty-cycle", action="store", dest="n_dutycycle",
+        p.add_argument("--duty-cycle", action="store", dest="n_duty_cycle",
             type=int, default=1, metavar="NUMBER",
             help="specify the duty cycle in percentage. default is 1 %%.")
         p.add_argument("-v", action="store_true", dest="f_verbose",
@@ -153,26 +153,35 @@ if __name__ == "__main__" :
                   enable_ldro=opt.enable_ldro,
                   enable_eh=opt.enable_eh, enable_crc=opt.enable_crc,
                   n_cr=opt.n_cr, n_preamble=opt.n_preamble)
-    max_packets = 86400./((ret["t_packet"]/1000.)*(100./opt.n_dutycycle))
+    ret["phy_pl_size"] = opt.n_size
+    ret["mac_pl_size"] = opt.n_size - 5
+    ret["sf"] = opt.n_sf
+    ret["bw"] = opt.n_bw
+    ret["ldro"] = "enable" if ret["v_DE"] else "disable"
+    ret["eh"] = "enable" if opt.enable_eh else "disable"
+    ret["cr"] = opt.n_cr
+    ret["preamble"] = opt.n_preamble
+    ret["duty_cycle"] = opt.n_duty_cycle
+    ret["t_cycle"] = (ret["t_packet"]/1000.)*(100./ret["duty_cycle"])
+    ret["max_packets_day"] = 86400./ret["t_cycle"]
     if opt.f_verbose:
-        print "PHY payload size    : %d Bytes" % opt.n_size
-        print "MAC payload size    : %d Bytes" % (opt.n_size-5)
-        print "Spreading Factor    : %d" % opt.n_sf
-        print "Band width          : %d kHz" % opt.n_bw
-        print "Low data rate opt.  : %s" % ("enable" if ret["v_DE"]
-                                            else "disable")
-        print "Explicit header     : %s" % ("enable" if opt.enable_eh
-                                            else "disable")
-        print "CR (coding rate)    : %d (4/%d)" % (opt.n_cr, 4+opt.n_cr)
+        print "PHY payload size    : %d Bytes" % ret["phy_pl_size"]
+        print "MAC payload size    : %d Bytes" % ret["mac_pl_size"]
+        print "Spreading Factor    : %d" % ret["sf"]
+        print "Band width          : %d kHz" % ret["bw"]
+        print "Low data rate opt.  : %s" % ret["ldro"]
+        print "Explicit header     : %s" % ret["eh"]
+        print "CR (coding rate)    : %d (4/%d)" % (ret["cr"], 4+ret["cr"])
         print "Symbol Rate         : %.3f symbol/s" % ret["r_sym"]
         print "Symbol Time         : %.3f msec/symbol" % ret["t_sym"]
-        print "Preamble size       : %d symbols" % opt.n_preamble
-        print "Packet symbol size  : %d symbols" % ret["n_payload"]
+        print "Preamble size       : %d symbols" % ret["preamble"]
+        print "Packet symbol size  : %d symbols" % ret["n_sym_payload"]
         print "Preamble ToA        : %.3f msec" % ret["t_preamble"]
         print "Payload ToA         : %.3f msec" % ret["t_payload"]
         print "Time on Air         : %.3f msec" % ret["t_packet"]
-        print "Duty Cycle          : %d %%" % opt.n_dutycycle
-        print "Max Frames per day  : %d frames" % max_packets
+        print "Duty Cycle          : %d %%" % ret["duty_cycle"]
+        print "Min span of a cycle : %d sec" % ret["t_cycle"]
+        print "Max Frames per day  : %d frames" % ret["max_packets_day"]
         if opt.debug_level:
             ret0 = get_toa(0, opt.n_sf, n_bw=opt.n_bw,
                            enable_auto_ldro=opt.enable_auto_ldro,