year_start        =1990
month_start       =04
year_end          =1999
month_end         =04
month             =04
index_back_forward=3
index_terrain     =1
hour_intvl        =6
ii_lon            =72
jj_lat            =36
kk_level          =26
datafile_list     =C:\Jin_EC\WOUDC_process\1_trajectory\woudc0.list 
IONS_data_dir     =C:\Jin_EC\WOUDC_data_O3\
traj_dir          =C:\Jin_EC\WOUDC_data_trajectory\
terrain_file      =C:\Jin_EC\WOUDC_process\1_trajectory\elevation.dat
output_dir        =C:\jp_o3_climate\WOUDC_process_2011\2_mean_trop_stra_SL\out\
output_name       =1990s-04
string_period     =Apr. 1990-1999