function ii = access_ind()

ii.first_good_bin   = 1;
ii.last_good_bin    = 2;
ii.U_ship_absolute  = 3;
ii.V_ship_absolute  = 4;
ii.user_flag_1      = 5;
ii.user_flag_2      = 6;
ii.user_flag_3      = 7;
ii.user_flag_4      = 8;

