Route information for S 4

        5    10   15   20   25   30
    ----+----+----+----+----+----+-
Dec     ¦    ¦    ¦xxxxx  x ¦ x  x 
Jan  xx ¦xxxxx  xxxxx  xxxxx¦ xxxxx
Feb   xxxxx  xxxxx¦ xxxxx  xxxxx ¦ 
Mar   xxxxx  xxxxx¦ xxxxx  xxxxx ¦x
Apr xxxx¦ xxxxx  xxxx  ¦ xxxx  xxx 
May  x  xxxxx¦ xxxxx  xxxxx ¦xxx x 
Jun  xxxxx   xxxx ¦xxx x  xxxxx  x 
Jul xxxx¦ xxxxx  xxxxx ¦xxxxx  xxxx
Aug x  xxxxx ¦xxxxx  xxxxx  xxxxx¦ 
Sep xxxxx  xxxxx  xxxxx¦ xxxxx  xx 
Oct xx  ¦xxxxx  xxxxx  xxxxx¦ xxxxx
Nov   xxxxx  xxxxx¦ xxxxx  xxxxx ¦ 
Dec xxxxx  xxxxx  ¦    ¦    ¦    ¦