DATA header_entry          # Header entry format 
{     
SHORT tdb_start_orb_index; # starting index into orbit db 
SHORT tdb_stop_orb_index;  # stopping index into orbit db 

SHORT first_seg_num;
SHORT max_seg_num;
SHORT data_cols;
SHORT first_obs_num;
SHORT prefix_recs;
SHORT item_bits;
SHORT rec_items;
SHORT hdr_recs;
INT   observations;
SHORT ind_items;
SHORT str_ind_recnum;
SHORT ind_recs;
SHORT ind_entry_items;
SHORT str_orb_tab_recnum;
SHORT orb_tab_recs;
SHORT orb_tab_items;
SHORT str_seq_tab_recnum;
SHORT seq_tab_recs;
SHORT seq_tab_items;
SHORT dbase_num;
SHORT orbiter_num;
SHORT chunk_num;
SHORT str_orbnum;
SHORT stp_orbnum;
STRING chunk_fname;
STRING file_date_tab;
STRING file_desc;
}