# identical to FS
len_line = length($0)
len_head = length($1 FS $2 FS $3 FS $4 FS $5 FS)
len_body = len_line - len_head
body = substr($0, len_head + 1, len_body)
# identical to FS
len_line = length($0)
len_head = length($1 FS $2 FS $3 FS $4 FS $5 FS)
len_body = len_line - len_head
body = substr($0, len_head + 1, len_body)